They really are lucky ladies: Samantha Titus, Katrina (Tina) Arandjelovic and Kimberly Perry are the brand new faces of Madonna and Lourdes Leon‘s beauty and clothing line, Material Girl. The girls beat out thousands of wannabe catwalkers in the brand’s “Lucky Stars” model search, and were handpicked by the mother-daughter duo to front the line.

“We set out to find someone who embodied the Material Girl lifestyle: a free-spirited girl with an interest in fashion, who isn’t afraid to express herself and let her true personality shine through,” Madonna and Leon said in a statement. “It came down to three girls who we absolutely loved and felt were true Material Girls, so we decided to make all of them winners.”

The ladies’ first ads, seem here, were shot in a New York City studio (Kelly Osbourne and Leon were both on set) and will debut in magazines, online and in stores later this month. The girls — who each won $5,000 in addition to the job — range in age from 19 to 21 and came from California, Illinois in New York. One runner-up, Briana Herrera, was named special correspondent for Material Girl and will blog on behalf of the brand.

Courtesy Material Girl

Osbourne, who’s been the face of the brand for a year, won’t appear in further ads, though she hopes to stay involved with the line. “I can’t even tell you what it’s done for my confidence,” she told PEOPLE in December. “To be a face of a fashion line? I’m not even a model citizen.”

Courtesy Material Girl

The Fashion Police star helped with the initial stages of the model search, going to open calls at malls around the U.S. before online voters — and later Madonna and Leon — chose the finalists and winners. “It gave me faith in the female kind again seeing these awesome young girls on stage,” she shared.

Be sure to check out behind-the-scenes footage of the “Lucky Stars” process (featuring Madonna and Leon) at facebook.com/materialgirlcollection. And find Material Girl makeup, clothing, intimates and outerwear at Macy’s stores and macys.com.

SHOP THE CELEBRITY STYLES YOU NEED TO STEAL — NOW!

Arriving at QVC’s runway show in New York Wednesday night, Camila Alves seemed to have a little extra sparkle, in the form of a stunning three-stone sparkler on her finger. The handbag designer was out for the first time since her Christmas engagement to longtime love Matthew McConaughey, and put her gorgeous engagement ring on display for all to see.

“I am really enjoying being engaged right now … no wedding plans as of yet,” she told reporters. But speaking to PEOPLE earlier in the week, she was happy to dish on her fiancé’s sense of style. “Matthew has great taste,” she said. “He always has great opinions on what works and what doesn’t.” He even gives input on Alves’s handbag line, Muxo, which she designs with her mother. “We are one big family so we share everything — including opinions on the creations for the line.”

Alves’s latest collection, which she’ll present on QVC this Saturday, was inspired by her recent travels through Texas, Arkansas, New Orleans, California and New York. “We are really having fun mixing all of the inspirations from the various landscapes that we’ve been collecting for some time now,” she shared.

Courtesy QVC

The Brazilian beauty fell in love with fashion at an early age; her mother, a designer by trade, would let her help with various projects. “It taught me so much about design,” she explained. “And after I had moved to the States I was looking for something to do with my mom to help the family in Brazil … so we created our first handbag together.”

Though the pair has their moments — “Sometimes we butt heads like any mother and daughter,” Alves admitted — they feel “blessed” to work together. “We have a great relationship, and we create in a very unique way together.”

Catch Alves on QVC Saturday, selling the latest from Muxo (including her favorite, a leather satchel with a kiss-lock front pocket, right), plus sales from GF’s Geren Lockhart, Dennis Basso, Mark Zunino and Lori Goldstein (10 p.m. EST). And tune in Friday (10 p.m. EST) for launches from Cristina Ehrlich, Isaac Mizrahi, Fern Mallis, Karen Zambos, Marc Bouwer and Cynthia Vincent.

–Kate Hogan

SHOP STAR LOOKS FOR LESS

Mary-Kate and Ashley Olsen may have a sister named Elizabeth and a brother named James (who goes by Trent), but that doesn’t mean their Elizabeth and James brand is in homage to their siblings.

“We wanted it to be based on a relationship between a young girl and a boy and tell the story through clothing,” Mary-Kate told WWD when they launched the contemporary collection in 2007. “It’s a clash between masculinity and femininity,” added Ashley.

Brand reps also confirm to PEOPLE that the line is not named after anyone in specific.

But try telling that to little sister Elizabeth. “In my mind, that was, ‘Oh cool, that means I get free clothes,’” she tells ASOS magazine of her presumed influence on the line’s moniker. “For two years, I didn’t [have to] buy anything.” The Martha Marcy May Marlene star also wears her sister’s collection throughout a spread in the mag and was recently spotted sporting the line’s $155 sunnies.

All is fair in love and fashion?

–Justine Harman

FIND OUT WHERE TO BUY STAR-LOVED LOOKS IN: ‘YOU ASKED, WE FOUND’

We’ve seen a lot of Kim, Kourtney and Khloé Kardashian, but the stylish sisters are revealing even more of their curves in new ads for the Kardashian Kollection denim line for Sears. The girls are taking their tops off in a racy pictorial — presumably to put the focus on the jeans. (Yeah, right.)

The Kardashians shared plans for their denim collection in September, around the time their eponymous collection launched in Sears stores. “We have to get everything tailored, so in this collection, we wanted to make sure that you didn’t have to tailor anything,” Kim told PEOPLE at the time. “It was the exact way we like it — from the fabrics being very comfortable and stretchy to fitting all of our body types.”

The popularity of the line means lots of expansion in the months ahead; after denim launches in about four weeks, according to co-creator Bruno Schiavi, home will follow, with swim not far behind. “We are shooting our new swim campaign actually in January,” Schiavi tells Celebuzz. “We’re very excited about that.” And we can’t even imagine those photos … Tell us: Have you shopped the Kardashian Kollection for Sears?

TAKE OUR QUIZ: GUESS THE STAR BARGAIN

Though she is reportedly expecting her first child, Sienna Miller‘s fashion baby has already flown the coop. After six years as co-creative directors at Twenty8Twelve, she and sister Savannah have stepped down from their joint role at the label.

“We’ve had a brilliant six years at Twenty8Twelve and are now looking forward to new pastures,” the sisters tell WWD. “We wish the brand the best of luck for the future.” (The statement is a stark contrast to the sisters’ feelings in 2010: “These are the clothes we wear,” Savannah told WWD at the time. “And we want to keep all our girls happy.”)

Confirming the Millers’ departure, as well as the label’s plan to forge ahead, is brand managing director, Nish Soneji. “We’ve had a great partnership with the Miller sisters,” he says. The vision “will continue under the direction of the Twenty8Twelve design team.”

Check out Sienna sporting a series of Twenty8Twelve designs over the past several years (above). Tell us: Which look is your favorite?

–Justine Harman

WEIGH IN ON MORE RED CARPET LOOKS IN ‘LAST NIGHT’S LOOK: HIT OR MISS?’

Shot by filmmaker Michael Polish, the movie follows the actress through a Moroccan street market — and through several fashionable costume changes — to the tune of Broken Social Scenes’s “Ungrateful Little Father.”

Bosworth and her JewelMint team (which includes stylist pal Cher Coulter) launched the video series on Jan. 12 with the debut film, “The Look.” In the future, a new clip featuring the chic star will premiere at the beginning of every month.

So what makes this late January video so special? It was released in conjunction with the launch of Bosworth’s brand new Twitter account, @KateBosworth. And it comes with a deal: PEOPLE StyleWatch readers can get 20 percent off of their first JewelMint purchase by using code Morocco20 at checkout. Happy shopping!

WANT MORE STAR-LOVED STUFF? CHECK OUT ‘YOU ASKED, WE FOUND: STAR LOOKS’

Avril Lavigne, who already lends her vision to a clothing line and two fragrances, wants to add some punk rock to your polish.

Sally Hansen has partnered with the singer for a limited collection of Salon Effects nail strips, launching in April. “I was really excited about the Salon Effects Real Nail Polish Strips — especially since they’re superquick,” she told WWD. “It’s supercool because the designs that I came up with are my personal style and vibe — they’re rock ’n’ roll and fun and bright and colorful. You have sparkles and little stars …”

Each $9.99 kit will include 16 nail polish strips, a cuticle file, a mini-file and a buffer for quick and easy application. But the 27-year-old, who calls herself “a really visual person,” says she wants to continue to add to her beauty empire: “I think it would be cool to do hair color.”

–Justine Harman

GET THE DIGITAL DOWNLOAD IN: ‘COOL WINTER NAIL TRENDS TO TRY NOW!’

They’ve lent their keen eye to designing jewelry, but Kate Bosworth and stylist pal Cher Coulter are teaming up for a new endeavor.

The New York Times reports that the duo is working on a “denim collaboration,” which makes perfect sense for the actress, who was named PEOPLE’s 2011 “Jean Queen.”

“Kate loves denim because it’s easy and casual,” Coulter told PEOPLE in October. “She always wears denim to remain comfy while running around town. On the flip side, she also loves to dress up denim by pairing it with a silky button-up and a necklace slung just under the shirt collar.”

We hope she infuses the forthcoming line with the same creative approach!

–Justine Harman

SHOP MORE STAR-APPROVED LOOKS IN ‘YOU ASKED, WE FOUND’

She’s movin’ on up! Whitney Port is taking her Whitney Eve collection to the big leagues, planning her first-ever solo show at New York Fashion Week in February.

“My collection has grown so much over the past few years, and the next step for me as a designer was to put on my own runway show,” the former reality star said in a release. “I am so excited to show on schedule as part of Mercedes-Benz Fashion Week in New York, and can’t wait to show my new fall collection on the runway.”

Port, who starred on MTV’s The Hills and The City, launched her collection in 2008, creating pretty party dresses and tailored, menswear-inspired looks.

“[It's] really colorful and really a mix of business sophisticate with a funky street-girl aesthetic — the good mix of L.A. and New York vibes,” Port told PEOPLE of her line in August. Calling her ideal customer “a girl who’s career oriented and motivated but also likes to have a good time,” she said she was focusing all of her energy on Whitney Eve, telling PEOPLE, “I’m … trying to become a better designer and learn the whole trade.”

FASHION WEEK GUIDE: STAR DESIGNERS YOU MUST KNOW

Ivanka Trump has been icing the wrists and ears of Hollywood stars with her namesake jewelry line for years now, but there’s one celebrity fan in particular that she’s extra proud to name drop these days.

Speaking to InStyle last week before accepting a Good Award from the Diamond Empowerment Fund, Trump discussed the “Oval Os” she was wearing — 18-karat white-gold earrings that feature 11.56 carats of diamonds. “I now call them my Oprah Os because she loves them,” the new mom revealed.

Winfrey may be one of few fans who can afford them; the large earrings go for $38,000, the medium (3.71 carats) for $13,000 and a small pair (1.23 carats) for $5,700. “O” my!

“I characterize my jewelry collection as timeless and glamorous but always classic,” Trump told PEOPLE in 2010. “I’ve added femininity and a modern twist to jewelry that resonates with both younger woman and an older consumer.” Tell us: What’s the most expensive piece of jewelry you’ve ever purchased?

WHO WILL BRING THE BLING TO THE GOLDEN GLOBES? VOTE NOW!

Informed by India’s rich color palette, Nicole Richie‘s spring 2012 Winter Kate collection is a warm weather fantasy wardrobe. ”I’ve always loved the possibility of being able to transform yourself through fashion,” the creative director says in a release.

The mostly silk collection boasts exclusive patterns and cultural motifs, like the elephant God Ganesh. Highlights include patterned shifts and tunics, the asymmetrical “Jazbaa” dress (above left) and a rose-colored, multi-tiered “Kamala” frock, modeled after the traditional Indian sari.

The Far East-inspired ready-to-wear and accessories ($78-$695) will be available at high-end department stores and online at Shopbop.com starting mid-February. Tell us: What do you think of Richie’s latest collection?

–Justine Harman

SEE WHAT STARS ARE WEARING NOW IN ‘WINTER WORKOUT LOOKS’

After debuting his line to mixed reviews during Paris Fashion Week, Kanye West has stayed relatively mum on the topic of fashion — until now.

Following the creation of the possibly fake Twitter handle @dwbykanye, billed as the official page of his line and which has since been suspended, West took to his own verified account to “clarify a few things.”

“I really appreciate the fake DW twitter page but since it’s not official I can’t co sign any information on it,” he told fans Wednesday. The star then detailed his fashion résumé before announcing a new venture, DONDA, named after his late mother.

“DONDA will be comprised of over 22 divisions with a goal to make products and experiences that people want and can afford,” he explained of the enterprise, whose goal is to “pick up where Steve Jobs left off.”

While on contract with Louis Vuitton, for whom he designed five pairs of sneakers in 2009, West said he embarked on his covert fashion education. And following an “undercover” stint as a consultant at Fendi, the rapper claimed to have spent two years shadowing the shoemakers at the Giuseppe Zanotti factory in Rome.

“Being a celebrity has afforded me many opportunities,” he mused, “but has also boxed me in creatively.”

–Justine Harman

PLAY FASHION CRITIC IN ‘LAST NIGHT’S LOOK: HIT OR MISS?’

When Rachel Bilson dived into creating a collection for ShoeMint, she didn’t merely dip a toe.

“Understanding the footwear design nuances that make a shoe feel both authentic to my personal style, and are versatile enough to work with all women’s styles, has been a terrific learning experience,” she tells PEOPLE.

“We’re lucky to be involved in every part of the process,” adds collaborator Nicole Chavez, who calls Steve Madden’s “craft of molding something like a piece of leather into a gorgeous finished shoe” an “art form.”

In this never-before-seen video (after the jump), the team grants access behind the velvet curtain. Watch as a towering wedge is drawn, cut and stretched to perfection!

And once you’re wooed by the craftsmanship, don’t fight the urge to splurge: StyleWatch readers and new ShoeMint.com members can enter promo code StyleWatchDeal to receive 20 percent off their first purchase (ie. $64 instead of $80!)

–Justine Harman

SHOP TO IT WITH MORE EXCLUSIVE STYLEWATCH DEALS! 

When Jessica Simpson slaps her name on something, that something usually sells. It’s no coincidence, then, that the shrewd businesswoman, whose fortune is estimated at nearly $1 billion, knew exactly how to infuse a fine jewelry line for Zales with a little bit of Jessica.

The Jessica Simpson Fine Jewelry collection — featuring earrings, rings, bracelets and more — includes a variety of butterfly-shaped designs based on the star’s handwriting. (The line’s signature butterfly: a mirror image of the ‘J’ in Jessica’s signature, as visible in the butterfly stud earrings, left.)

“This collection has allowed me to create pieces that truly reflect who I am,” Simpson says in a release. The pieces “can become a keepsake for life.” Ranging in price from $79-$799, the line is available exclusively at Zales stores nationwide and Zales.com. We think everything she touches turns to gold (or silver!), but want to hear from you. Tell us: Will you be buying Simpson’s ‘signature’ studs?

–Justine Harman

SHOP MORE AFFORDABLE BLING IN ’10 GIFTS UNDER $10′

When Kat Von D decided to design a fashion line, she knew people would have their preconceived notions. “It was easy to predict that most people would be pleasantly surprised by the sophistication of the line,” she tells PEOPLE. “By no means am I rebelling from my ‘tattoo roots,’ but I am showing the world what truly inspires me.”

Despite recent disappointments in the love department, the former L.A. Ink star says she is drawn to the topic. “The inspiration [for the line] varies from elements of nature to architecture, to love letters, and all things from time passed, with a modern romantic approach.”

The resulting collection, KvD Los Angeles, is comprised of wearable items including comfy harem pants, fringed tanks and structured outerwear. “I’ve become most attached to the highly tailored pieces, especially the coats,” she says, singling out the military-inspired “Napoleon” as her favorite.

“To me, I think it’s important when creating anything for the public, that it is something that all walks of life can feel connected to,” she explains. “If you stick to your guns and create from a genuine place, there is a way to find a balance between the ‘extreme’ and the ‘safe.’”

For further proof, check out the sultry pic below of the star wearing the gilded” Medusa” dress from the forthcoming spring 2012 collection.

Courtesy Patrick Hoelck

–Justine Harman

GIVE A CELEB-DESIGNED GIFT THIS HOLIDAY!

Imagine ringing your best friend to ask that silly question girls ask, “What are you wearing?” and having her respond, “Why not something one of us designed?”

That’s the reality for real-life pals, Katie Holmes (who helms Holmes & Yang) and Victoria Beckham, whose colorful, yet restrained collection consistently sells out on luxury e-tailer Net-A-Porter. “We go to the same events, and we’ll call each other to ask, ‘What color are you wearing?’” Holmes tells ELLE. “I’m always interested in what she’s liking for the season.”

And Holmes isn’t the designer’s only A-list fan. “When we have Victoria’s stuff in the studio, it’s the first thing Cameron Diaz tries on,” stylist Rachel Zoe says of her client. “But any woman would feel sexy in her dresses.”

All of that feedback must be humbling for Beckham, who was anxious to tell another designer pal of plans to take her knack for fashion to the big leagues. “We went out to dinner one night, and he said, ‘I saw that you put out a collection,’” she recalls of breaking the news to Marc Jacobs. “I felt embarrassed to tell Marc Jacobs that I — me, ex-Spice Girl, married to a footballer — was creating a fashion line.”

–Justine Harman

FOR MORE FASHION INSPIRATION, CHECK OUT ‘WOULD YOU WEAR THESE TRENDS?’

Hold on, ladies! Designers Mary-Kate and Ashley Olsen take a speedy, silly ride down a sled hill in the latest installment of their StyleMint “T Moment” series. The sisters snuggle into their winter T-shirts — and hold tight to each other — as they pass snowmen and holiday stockings on their ride.

Think your holiday plans top a seasonal sled ride? Tell the girls about your favorite winter activity, and you could win a year of tees from StyleMint. Visit facebook.com/stylemint for more information.

YOU ASKED, WE FOUND: STAR LOOKS

“I am a jeans lover,” says Big Bang Theory star Kaley Cuoco. “I literally live in them. So I wanted them to be as comfortable as they make me feel.” The actress searched high and low for her perfect pair, but was never able to find them. So when Raven Denim creative director Yael Torbati asked her to co-design a pair for the brand, she jumped at the chance.

Now available online, the “Kaley” skinny jeans ($193) come in dark olive or jet and feature zipper details. “It’s very clean and sexy, a perfect skinny to dress up or down,” Torbati says, adding that Cuoco was the perfect guest designer. “We selected [her] for her casual offbeat charm and cool, approachable style.”

For every pair of “Kaley” skinnies sold, Raven will donate 20 percent of proceeds to the Friends of Animal Foundation. “It wasn’t a tough choice,” Cuoco, an animal lover, says of selecting the charity. “We have to give a voice to the creatures that don’t have one.”

Actor Brian Austin Green created two men’s styles to benefit the Friends of Animals Foundation, as well; find his designs on ravendenim.com.

SHOP STARS’ FAVE JEANS IN ‘I REALLY LOVE MY DENIM’

Is it hot in here, or is it just Mario Lopez? PEOPLE’s former “Hottest Bachelor” is stripping down — again! — as the face of his very own underwear line, RatedM.

“I’d always wanted to get into the apparel and fitness world, and I thought, ‘Why don’t I just start my own [line]?’” he tells WWD.

The collection, developed with the masterminds behind 2(x)ist, includes three styles: elementary, boxers and briefs made of a cotton/polyester/spandex blend; atelier, offering a “conversational waistband” and shirts with adjustable hems; and play, intimates made with a sleek combination of mesh and single-kit jersey.

“It’s smart, sexy and masculine,” Lopez says. “We like to say it goes from the boardroom to the bedroom and everywhere in between.”

To shop the brand ($16 and up) — and get a little Lopez eye candy — visit freshpair.com. And expect more gear from the new dad in the months to come. “I’d really like to apply the same philosophy [of RatedM] to fitness apparel,” he shares. “Hopefully this is just the beginning.”

ENJOY MORE EYE CANDY WITH OUR ‘SEXIEST MAN ALIVE’ PHOTOS

Her clothing line for HSN is selling like crazy, but Queen Latifah says finding clothes as a plus-size woman was at one time a constant struggle.

“A lot of manufacturers don’t respect the curvaceous woman,” she laments in the January issue of ESSENCE. “They don’t respect our dollar or our shape.” Thankfully, she’s found an understanding vendor in HSN. “[It's] been such a great partnership,” she says. “I’m happy to make women’s clothing I really like.”

In August, Latifah told PEOPLE she was designing for real women who want affordable, wearable fashion. “It’s really something you can incorporate into your existing wardrobe,” she said of the tops, jackets, jeans and handbags in the Queen Collection. “I mean these are things that are really beautiful, but they’re very wearable. We’re really trying to make sure that they have the best fabrics possible, that it feels good on the body. I’m a Pisces, I’m sensitive; I like things to feel good on my skin.”

Designed for women sizes 2 to 24, the collection is everything the actress wants: “stylish clothes that fit my body, and make me look good and feel good about myself,” she shared. “I wanted to offer basically the same things that I have the opportunity to have.”

Latifah, known for singing, acting, hosting and now designing, says her many talents are making the way for comparisons to a fellow jack-of-all-trades. “People say I’m going to be the next Oprah,” she shares with ESSENCE. “No. Oprah is still Oprah. I’ll be the next me. I feel like there’s always a lane for me as long as I’m true to myself.” For more with Latifah, visit ESSENCE.com.

SHOP HOLIDAY GIFTS FROM CELEBRITY DESIGNERS