When it came to accessorizing her newly platinum do for Sunday’s Grammy Awards, the always-edgy Rihanna went for some depth at the root, plunging Armani — and seriously pricey digits!

Sporting Red Carpet Manicure’s “Amor 24,” a 24-karat gold polish that retails for a whopping $5,000, the performer also added tiny dollar signs to her pinky fingers.

Brand reps tell us that upon spotting the gilded lacquer, Rihanna promised to “guard it with her life.”

Additional limited edition bottles of “Amor 24″ will be auctioned off for charity, but a more affordable version, “Award Winning,” will be available this spring on RedCarpetManicure.com for $9.99.

–Justine Harman

WANT MORE? COOL WINTER NAIL TRENDS TO TRY RIGHT NOW!

New week, new haircuts! Demi Lovato and Miley Cyrus both changed up their hairstyles (again) last week, sharing photos of their new looks on Twitter.

Lovato — a natural brunette who was most recently a redhead — went blonde Saturday. “Thank you SO much Nine Zero One salon for my new locks,” she wrote, asking fans for feedback. They must’ve liked the look: later that day, she Tweeted, “Haha Demi Blondevato is a trending topic?!! Y’all are funny!”

Cyrus’s change was a bit more subtle: the singer, who took five inches off of her hair last month, went a bit shorter and added some face-framing layers. Her Tweet of “You likey?” was met with compliments like “fab” and “beautiful” from adoring followers.

We love both ladies’ new looks, but want to hear what you think. Tell us: Do you like Lovato and Cyrus’s new dos?

Courtesy Miley Cyrus

TRY STARS’ STUNNING HAIRSTYLES IN OUR ‘INSTANT MAKEOVER’

Jennifer Lopez‘s skin sure is glowing in her new fragrance ad — we know, because we can see it all. The sexy singer and American Idol judge strikes a daring pose — in the buff — for her new fragrance (her 18th!), Glowing.

“Glowing is such a clean fragrance,” she tells WWD of the scent, a follow-up to her first fragrance, Glow. “That’s what I’ve always been about. I like soapy, clean smells. This is a very woodsy scent. So it’s not exactly what I created 10 years ago — it’s the evolution of that.”

Describing Glowing as “earthy, clean and real,” Lopez says the fragrance is “kind of New York-y, darker and sexier.” It contains notes of cypress, orange flower, cassia flower, vanilla and cashmere musk, and as a special treat, the eau de parfum bottles light up for 15 seconds when spritzed. “We’re in the history making business, baby,” Lopez says, laughing.

Jokes aside, Lopez hopes that this is another fragrance that will last. “I always feel pressure to create a great fragrance — I always want it to be so special, this one especially because of Glow. We want it to be great, and I think it is.”

Find Glowing exclusively at Kohl’s stores beginning in May for $39-$65. Tell us: Are you a fan of Jennifer Lopez fragrances?

SHOP STARS’ SIGNATURE SCENTS

Leave it to Madonna‘s daughter to try a cool new look! Lourdes Leon stepped out on her way to school in New York Thursday, sporting a funky new half-shaved do. The stylish 15-year-old — who’s had long dark hair forever — had her hair up in a bun, bringing extra attention to the edgy style.

Leon hasn’t made drastic changes to her hair before, though she’s toyed with the idea. “I want royal blue hair but not a streak, like my entire head,” the teen designer wrote on her blog in December of 2010.

But at the time, she wasn’t so sure she’d get away with the change. “I read this blog aloud to my mother,” she continued, “and she is sitting here staring at me with no expression on her face, as if she doesn’t approve of it!” Wonder if Madonna gave this cut the OK? Tell us: What do you think of Leon’s look?

SEE THE STARS’ WACKIEST WINTER HAIRSTYLES

Fergie is continuing her foray into the glamorous life with yet another fab gig: the Black Eyed Peas frontwoman is the first-ever face of Wet n Wild. The brand announced the partnership on Friday; the singer will star in a series of campaigns beginning later this year.

“I’m someone who goes from light neutrals during the day to some really dramatic looks at night for the red carpet,” Fergie tells PEOPLE. “I love that I can find all of these colors with Wet n Wild. Plus, the company and I come from the same [California] hometown!”

In addition to serving as a brand ambassador, Fergie will launch some signature Wet n Wild products, too. “I think the brand is a realistic beauty buy for every woman out there,” she explains. “It’s beauty for all. It’s on-trend, it’s affordable and it’s easily accessible.”

The star will shoot her first campaign photos in March, and will wear Wet n Wild products to Sunday night’s Grammy Awards. “[Fergie's] versatility and range is perfectly aligned with Wet n Wild,” the company’s COO, Bill George, says in a release. “She has the unique ability to go from hip, edgy and sexy to red-carpet glamorous. We couldn’t be more thrilled to work with her.” Tell us: What do you think of Fergie partnering with Wet n Wild?

SHOP OUR EDITORS’ BEAUTY PICKS

When it came to partnering with Coty to create the ultimate perfume, Roberto Cavalli was primed for the challenge.

“I was waiting a long time to have such a special fragrance,” he told PEOPLE recently. “I spent a lot of time to create something that I really like.”

Sitting low in his chair, and surrounded by lanky employees with thick Italian accents, the storied designer detailed whittling the scent down to three key ingredients. “At the beginning they gave me a lot of small bottles and I didn’t know which one to choose because one was too sweet and the other one was too …” he trailed off. Clearly, creating a fragrance is hard work.

Comprised of a trifecta of harmonious scents — orange flower, roasted Tonka bean and peppercorn for a spicy note — the eponymous scent was created as a tongue-in-cheek homage to the designer’s late mother.

“She adored perfume,” he said, his eyes glassing over with remembrance. “She used to buy the most horrible, cheap perfume. It was strong, strong perfume. I like mine because it is soft, delicate … not too much.”

So when asked which of his A-list fans would best embody his “sexy, feminine, aggressive” scent, Cavalli was quick to choose Jennifer Lopez. “It’s for a woman full of energy,” he mused. “I can see Jennifer singing and dancing with my perfume. I would love that.”

–Justine Harman

SHOP STARS’ SIGNATURE SCENTS!

Best known for her spitfire sense of humor and otherworldly good looks, Olivia Wilde’s stay-gorgeous routine is surprisingly girl-next-door.

“[I wash] and moisturize my face with drugstore brands like Cetaphil and CeraVe,” she tells PEOPLE.

And when that newly lopped do becomes a hassle, the TRON star looks to easy solutions. “I’m into cool stretchy headbands,” she says. “I throw it up and try to make it look interesting and put on a headband and then it looks like it was all intentional.”

While her beauty basics are decidedly simple, Wilde’s fitness routine runs the gamut from the serious to the silly. “I need kind of Ashtanga, like good, serious yoga,” she explains. “I never feel more beautiful than after I’ve really spent some time breathing.”

But when downward dog isn’t cutting it: “Hula hooping is one of those things that everybody sort of scoffs at,” she adds semi-seriously, “but I know people who have lost serious weight hula hooping.”

To learn more about the Revlon ambassador’s basic and bodacious beauty booty (can you say wasabi eye drops?), pick up the newest issue of PEOPLE, on stands now.

–Justine Harman with reporting by Pamela Edwards-Christiani

CHECK OUT OUR MUST-HAVE BEAUTY PICKS & CELEB GET-PRETTY PRODUCTS

She’s taken two nights off from new mommyhood this week to support hubby Jay-Z, but Beyoncé needn’t look further than her fingernails to be reminded of the new girl running the world these days: daughter Blue Ivy Carter.

“You see the blue nails. You see the IV tattoo on her finger. It’s clear that she was bringing Blue along with her because she doesn’t want to be away from her for a second,” Beyoncé’s longtime manicurist, Lisa Logan, tells PEOPLE of her Monday manicure.

Logan, who painted the singer’s fingernails with Nails Inc.’s new “Baker Street” polish (the star accented the look with a two-finger ring by Bing Bang for WeSC), says the whole experience felt serendipitous. “I don’t roll with less than 200 bottles of polish on any given day,” she explains. “When I pulled all of my colors out, [Baker Street] and two other colors were sitting at the top of the pile, and [Beyoncé] said, ‘I want this!’ She didn’t even look or blink at the other colors. She was like, ‘Oh no, I want this,’” Logan recalls. “Ironically, when I came in, the first thing she asked me for was Minx. I always have Minx nails, [but] this was the one day I didn’t have them on me!”

So how is the newly manicured mom adjusting to motherhood? “Amazingly,” Logan says. “When I see her, I’m like, ‘Girl, you’re glowing.’ She’s so elated. Motherhood is written all over her face. She’s owning it and wearing it well.”

–Carlos Greer

SHOP OUR EDITORS’ BEAUTY PICKS

Model Chrissy Teigen has had more than her share of painful razor cuts. “I go very fast, I’m often shaving on the go,” she tells PEOPLE. “I shave twice a day — I have dark hair, I have to — and I’m doing it so often that I want to feel smooth, not dry.”

Though she’s been guilty of using men’s razors — stealing her dad’s blades when she was younger, and swiping fiancé John Legend‘s Gillettes from time to time — the Sports Illustrated stunner is now enjoying smoother, softer shaves thanks to the new Venus & Olay razor, the official razor of SI‘s upcoming Swimsuit Issue.

“It’s the first beauty partnership for SI,” Teigen explains. “We’re constantly thrown different beauty products and things people want us to take photos with, but it’s not fun unless it’s something you really believe in.” As part of the partnership, Teigen will star in upcoming beauty-related websiodes on si.com in conjunction with the Swimsuit Issue’s release.

Needless to say, Teigen’s now addicted to the two-in-one razors, which feature five blades and a moisturizing shave gel bar. (The products will hit drugstores in March, and range in price from $9-$19.) “I was going to wear this long, Gothic-y black dress to the Grammys this weekend,” Teigen says, “but now I’m making it a specific point to get my smooth, soft goddess legs on the red carpet.”

As an honorary Venus “goddess,” Teigen joins the ranks of Jennifer Lopez, who famously flaunted her gams for the brand, too. “She’s so gorgeous, so to even be in the company of her is just ridiculous,” Teigen says. “Who would be better?”

So, with her new partnership in the news and SI‘s swimsuit edition on the way (it hits stands Feb. 14), can Teigen tell us anything about the ever-popular issue? “I would be screaming it all from the rooftops if I could,” she says, genuinely. “I will say I’m very excited for it to come out.”

–Kate Hogan

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She’s sampled chili, pancakes and a whole lot of steak on this season’s Top Chef, but Padma Lakshmi is miraculously avoiding weight gain and breakouts. How? By boxing. “A poet introduced me to it,” she tells PEOPLE of the sport, which she’s practiced for 10 years. “I just found it was a great workout, very gratifying.”

Lakshmi — who hits the gym two to three times per week with a trainer, and uses the speed bag, jumps rope and does calisthenics — credits boxing with her trim figure, as well as her glowing skin. “I think that sweating a lot and getting your circulation going influences your skin a lot, and helps everything rejuvenate itself,” she shares. (Regular facials, some Shiseido foaming face wash and a light moisturizer help, too.)

The former model showcases that skin — and her best boxing form — in Danskin’s “Move for Change” campaign, which also features Hilary Duff, Jenny McCarthy and Christie Brinkley. “The photo shoot was great,” she says. “It turned out to be a fun day.”

Lakshmi’s involvement with Danskin benefits her charity of choice as well; the company makes regular donations to the Endometriosis Foundation of America, a cause close to her heart. And that symbiotic relationship makes the star even happier. As she says, “It was a really great opportunity to partner with a brand that I’ve always loved, while raising awareness about my foundation at the same time.”

–Kate Hogan

CHECK OUT THE STARS’ BEST WINTER WORKOUT LOOKS

It’s officially a trend! Rachel McAdams is the latest star to add bangs to her hairstyle, debuting the look at the Los Angeles premiere of The Vow (sponsored by Ralph Lauren Romance) Monday night. The star stepped out in a sky-blue Vivienne Westwood dress and glimmering jewels, complementing her look with smoky eyes, red lips and her new blonde bangs.

McAdams joins a growing list of leading ladies who’ve added bangs to their hair recently, including Jessica Biel, Rose Byrne, Cameron Diaz (sometimes), Olivia Wilde, Kim Kardashian (who tried clip-ons) and Reese Witherspoon, who cut them to cover a forehead scar. Kelly Clarkson rocked them during the Super Bowl, and Sarah Michelle Gellar added a few face-framing bangs recently, as well.

We think McAdams always looks lovely, but want to hear your thoughts. 

CHECK OUT THE STARS’ WACKIEST WINTER HAIRSTYLES

With her hair constantly at the mercy of curling irons, straighteners and blow dryers, Nicole Scherzinger relies on hydrating products to keep her hair healthy. And now, she’ll likely have a lot of them at her disposable: the singer and former X Factor judge is the newest face of Herbal Essences.

“It’s amazing,” she tells PEOPLE of the new gig. “I have a big grin on my face and I’m glowing. I’m really proud to be partnered with this brand.”

Courtesy Herbal Essences

Though Scherzinger calls her “super-long” hair “strong,” she says it’s often hard to take care of because it is subjected to so much heat styling. “I always have to change hairstyles, whether it’s being on TV one minute to being on stage the next, then going to dinner or a meeting,” she explains. “It’s important to keep it hydrated, and use the right products to protect it from the heat.” To that end, she credits Herbal Essences’ Hello Hydration, Hydralicious and Long Term Relationship with locking in moisture and preventing split ends.

When she’s enjoying a day off, Scherzinger generally gives her hair a break, letting it air dry before tossing it up in a bun. But she’s no styling amateur herself: the day of her Herbal Essences shoot, the singer was even giving her glam squad advice. “I know all the mousses, honey,” she shares. “Normally people associate mousse with perms, but with this hair, are you kidding me?! Mousse equals volumizing.”

Scherzinger will appear in Herbal Essences’ print ads as well as commercials — some of which will feature her music. “It’s what I’ve worked so hard for my whole life,” she says. “Not only to have music as my driving force, but to build my brand and be associated with products I believe in — those that are a direct reflection of who I am.”

–Kate Hogan

TRY ON THE LATEST STAR HAIRSTYLES IN OUR ‘INSTANT MAKEOVER’

She recently headlined a Duran Duran music video and still gets booked to walk the most coveted runways, but Naomi Campbell says there’s nothing ‘super’ about her storied career.

“I would never call myself that,” she says of the term ‘supermodel’ in the March issue of Harper’s Bazaar. “I don’t have any superhuman powers.”

To that end, the 41-year-old works hard to maintain her famous figure. “For me, carbs are a treat now,” she says, admitting to doing “everything I can to keep my skin elasticated.” (While speaking with Oprah Winfrey in 2010 she confessed to going on 18-day cleanses and jumping rope to keep her face lean.)

“I still love what I do,” she explains, but instead of ‘supermodel,’ she’s drawn to terms including “transformation, reinvention, and chameleon,” buzz words which demonstrate a marked departure from her mantra in the late ’90′s. “I never diet. I smoke. I drink now and then. I never work out. I work very hard and I am worth every cent,” she infamously told Playboy in 1999. Read more on Campbell at harpersbazaar.com/naomi and in the latest issue of Harper’s Bazaar.

Courtesy Terry Richardson for Harper’s Bazaar

–Justine Harman

CHECK OUT STAR-LOVED PIECES IN ‘I REALLY LOVE MY…’

It wasn’t just about planking; Katy Perry‘s recent stint as a mermaid had to do with her latest series of ads for haircare line ghd. The singer channels Little Mermaid Ariel in her new U.K.-only campaign, (ironically) advertising a hair dryer from below sea level.

“I love it because I’m such a fan of the Disney movies,” the newly single star says of her campaign, shot by David LaChapelle. “Ariel is such a big influence. It’s always fun to dress up once in your lifetime as a mermaid and have that fish fin tail.”

The glimmering “tail” Perry wears in the photos was custom-made by a Dubai-based designer, but the singer’s favorite part of the look seemed to be wearing the lavender wig. “It was fun,” the blue-haired star shares. “It’s as if Lisa Frank had done The Little Mermaid.”

So should we expect to see Perry — who explored past decades in her last round of ads — donning a mermaid costume on her next tour? “I would wear it again,” she says. “I actually thought about wearing it for Halloween.” Tell us: What do you think of Perry’s aquatic ad?

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Fresh off of her sexy Super Bowl commercials, Adriana Lima is gearing up for a romantic Valentine’s Day with husband Marko Jaric. But surprisingly, she’s not out looking for any gifts.

“It’s Valentine’s Day — shouldn’t guys be out shopping for us?” she jokes.

Lima is the face of Victoria’s Secret’s new, limited edition Bombshell in Love fragrance, a follow-up to the successful Bombshell scent and “passion in a bottle,” the supermodel says. The perfume — which has notes of pink grapefruit, Asian pear, purple freesia, sandalwood and cedarwood — is $49 for a bottle (and $25 for body mist).

But Lima is hoping for roses this Feb. 14 — and some sexy underthings, too. “Lingerie from Victoria’s Secret is the best gift to receive since it’s the sexiest present in the world,” she says. “I especially love the Body by Victoria Demi Bra and Hiphugger Panty … it comes in a heart print for Valentine’s Day, which is fun and flirty.”

However, if you don’t have a Valentine to celebrate with this year, Lima thinks it’s perfectly acceptable to celebrate yourself: when asked if it’s OK for a woman to buy herself a Valentine’s Day gift, she answers enthusiastically, “Yes!”

But until the calendar hits Feb. 14, Lima will be focused on another holiday: New Year’s. Specifically, her aspirational New Year’s resolutions, which include learning to play piano, doing more boxing, getting a driver’s license and meeting the Dalai Lama. So … how are those going? “It’s still early,” she says. “Still working on those resolutions!” Tell us: What do you want for Valentine’s Day?

SHOP STARS’ SIGNATURE SCENTS

We all know Rihanna can Talk That Talk, but who knew she was a Gossip Girl too?

When the singer debuted a sneak peek at her new platinum do (which she’ll sport on an upcoming cover of ELLE), we couldn’t help but think of another towheaded trouble maker: Taylor Momsen.

With that chunky fringe and stained pout (not to mention that major ‘tude!), Rihanna is the spitting image of a good Upper East Sider gone bad.

But while the look may not be permanent (as we all know, she’s quite the quick change artist), it’s not exactly temporary either: “bleach + weave” she Tweeted a curious fan. Tell us: Who looks better with a platinum fringe?

–Justine Harman

SEE MORE DARING LOOKS IN: STARS’ WACKIEST WINTER HAIRSTYLES

Nearly 84 percent of StyleWatch readers said they love Reese Witherspoon‘s new bangs, but there’s a somewhat dark reason behind the star’s new hairstyle. During an interview with Graham Norton, airing Saturday night on BBC America, Witherspoon reveals details about her recent car accident — and the scar it left behind.

“I was jogging and I got hit by a car,” she shares. “They said I am very hard-headed because I landed right on my head and I have a scar, hence my new hairdo. I don’t remember much about it but miraculously and thank God, I am fine.”

Though she didn’t press charges against the driver, an 85-year-old woman, there were legal repercussions. “They took away her license and gave her a bus pass,” the actress explains.

Moving into lighter territory, Witherspoon — who stars in the upcoming romantic action comedy This Means War — reflects on her stellar 2011, which included her wedding to Jim Toth and a meeting with the Duke and Duchess of Cambridge. “It was really fun,” the actress shares. “[Kate] was lovely and funny and she said some sweet girly things. I think she is handling herself so beautifully.”

–Kate Hogan

Though we’re still scratching our heads over the definition, ‘aristocratic sauvage girl,’ we think Felicity Jones’s newly revealed Dolce & Gabbana beauty ads certainly make an impact.

In the color-rich ads for the brand’s Khol collection ($20-$59), the up-and-comer looks every inch the Hollywood vet, sporting a perfectly smoky eye and deeply saturated gloss.

Check out a behind-the-scenes clip (below), in which the Like Crazy star says the ad marks her first time wearing a full-blown red lip. “[It's] a new direction for me,” she admits. “But with Pat McGrath’s incredible artistry, I’ve tried something slightly different.”

We think she looks insanely gorgeous, but want to hear from you. Tell us: What do you think of Jones’s Dolce & Gabbana The Makeup ads?

–Justine Harman

WEIGH IN ON MORE BOLD STYLES IN: ‘WOULD YOU WEAR THESE BEAUTY TRENDS?’

Bieber called: he wants his swoosh back! Though the pop star’s once-iconic hairstyle is no more, Juno star Olivia Thirlby is picking up where he left off, trading her long brunette locks for a feminine version of his cut. Popping up at the Sundance Film Festival in Park City, Utah, last week, the starlet showed off her new look, which references Bieber’s with its bowl-ish shape and sweeping bangs. She’s got the perfect face for a pixie, but we want to know what you think. Tell us: Are you loving Thirlby’s Bieber-esque haircut?

VOTE NOW ON MORE STAR HAIR CHANGES

Despite her influential pixie and daring red carpet acumen, Emma Watson doesn’t consider herself glamorous.

“My problem is that I am a little bit boring,” she admits to French Elle. “I don’t wear designer bags or big sunglasses.”

And regardless of access to designer duds, the Harry Potter star’s downtime is underscored by a more casual approach to fashion: “When I don’t have to play Emma Watson in public, I’d rather not put myself out there,” she explains. “I have to be more careful with my look in my everyday life.”

But what about those ubiquitous Lancôme beauty ads? “Someone asked me why I accepted this job, as I wanted to stand in the shadows,” she says. “Actually, I gave up the idea that I could [ever] become anonymous again!”

–Justine Harman

CHECK OUT MORE STAR STRANDS IN: ’10 HAIRDOS THAT TURNED HEADS!’