Peter Wintersteller/Berliner

In spite of Kristen Bell’s busy acting career, the Couples Retreat star still took the time to make saving the world look stylish. Last week, Bell joined Pete Wentz and Rachel Bilson to co-host the Guess/Vanity Fair party in Los Angeles to launch special edition organic Guess T-shirts that benefit the nonprofit organization Invisible Children. Pairing one of the T-shirts with a sexy Vena Cava dress and Christian Louboutin pumps, Bell talked to PEOPLE about her involvement with the organization, which promotes youth education and economic development in war-torn regions of Central East Africa. “It’s just standing up for humanity, which I think is really important for us to do for each other,” she said. Bilson agreed, saying, “It’s also important to spread the word about these T-shirts. You can buy them, and all the proceeds go to Invisible Children.” The party stayed lively with Wentz behind the DJ booth and attendance by celebrity friends such as Annalynne McCord and Eliza Dushku with boyfriend Rick Fox. Buy your own Guess Invisible Children T-shirt for $26 on Guess.com, with 100% of the proceeds going to the organization. –Susan Yara

Stefanie Keenan/WireImage

Casual never looked as chic as it did at Hollywood’s Chateau Marmont last night, where stars like Rachel Bilson, Mandy Moore and Lauren Conrad slipped into their best L.A.-cool fashions in celebration of Madewell’s Fall Denim Tour with Lucky magazine. And for Bilson, whose mom, spiritualist Janice Bilson, made a special appearance reading tarot cards for the superstar guests, style has always been in the cards. “I really look up to a lot of my peers and how they dress,” Rachel, who was wearing a Madewell dotted tank, told PEOPLE of how she picks up style tips. “I love to admire other people.” And in a town filled with famous fashionistas, there’s plenty of inspiration to be had. “Ashley Olsen I think is great, Diane Kruger, Sienna Miller — all those people obviously have good style, so it’s nice to see that around you. Your peers surround you, and they all look good, so that’s great.” –Reporting by Pearl Barraclough

Courtesy of Lucky Magazine

Since her days on the O.C., Rachel Bilson’s always-chic and on-trend street style has turned her into a bona fide fashionista. So what is it about the 28-year-old star’s style that keeps us intrigued? “I’m constantly trying new things and experimenting, so I never really settle on one style,” Rachel tells Lucky Magazine. “By the time I figure out how to define my look, I’m usually ready to move on to something else.” And come fall, Rachel will be experimenting with one of the season’s must-haves. “I’m excited about the great jackets with strong shoulders this season. It’s a cool throwback to the ’80s,” says the November cover girl. Though Rachel is fond of an ever-changing wardrobe, she does have her favorites. “I’m a huge fan of Helmut Lang for everyday items that are comfortable, easy to throw on, and always look good,” she says. Another one of Rachel’s favorite designers is Brian Reyes. “[He] makes the most beautiful, feminine clothes. I’m always eager to see what he does next.” And being the fashionista she is, the designer is sure to plant his superstar friend in his front row come New York Fashion Week. Lucky girl! Read more of Rachel’s interview with Lucky where she dishes on her accessory philosophy and beauty picks at luckymag.com. And don’t forget to pick up your November issue on newsstands October 6.

CLICK HERE TO SEE RACHEL’S LUCKY COVER AND ANOTHER IMAGE FROM THE SHOOT

Courtesy of Lucky Magazine

Courtesy of Lucky Magazine

Ace Pix

What would Fashion’s Night Out be without some shoe shopping? Rihanna, Rachel Bilson, Katy Perry and Michelle Trachtenberg partied up a storm while shopping for shoes at designer Giuseppe Zanotti’s Upper East Side boutique. Rihanna, clad in a clingy black hooded dress by Cover and Giuseppe Zanotti for Balmain booties, pursued the shelves of shoes with girlfriends and her stylist Mariel Haenn. After settling on a pair of suede leopard-print wedges, the singer and designer himself hit the dance floor rocking out to “Last Dance” by Donna Summer. An onlooker tells PEOPLE, “I’ve never seen anyone dance and laugh so much at a fashion party before in my life!” Bilson skipped out on the dance party to try on close to twenty pairs before walking away with ankle booties and wedge sandals. And while Rachel played dress-up, Trachtenberg and Taylor Momsen made friends with Perry before picking out their own new shoes. Michelle settled on a pair of over-the-knee embossed leather boots, and Taylor stuck to her ’90s grunge style with crystal-encrusted flat biker boots. No word yet on what Katy took home, but we are sure they are just as drool-worthy as the rest. Click here to see where more stars partied on fashion’s biggest night out, and be sure to follow us on Twitter at Twitter.com/StyleWatchMag for all the latest Tweets from the Fashion Week!– reporting by Hitha Prabhakar
 

Jeff Vespa/Wireimage

For a sexy, flattering shape, look no further than Phillip Lim.  His intricately beautiful designs and unique structure continue to garner attention from fashion-savvy celebrities, who rushed to help the N.Y.C. designer celebrate the one year anniversary of his West Hollywood boutique. “The shapes are unbelievable. I’m a girl without much shape on my own so I appreciate a designer who knows how to accentuate a women’s body,” 90210 star, Shenae Grimes told PEOPLE.  Adds host Rachel Bilson, “He really designs for every women.  Every article of clothing is amazing, you literally walk into his store and want everything.  If I had it all in my closet I’d be like the best-dressed person!” The store itself is another example of Lim’s attention to detail.  The designer and California native said,  “The store is just a simple palette, when you walk in, it’s like the cleansing of the palette when you go inside it exposes all the tastes and the spices.”  That spice is what makes Molly Sims a fan, “Everything is a little off.  He’s never going to put something together that is expected…and he pulls off being very conservative in a very vintage way. Wanting to create a special night reminiscent of a summer concert, Lim chose his favorite band, The Duke Spirit to serenade the crowd on the outside patio and personally consulted with his celebrity clients before the event.  Of her outfit, Kristen Bell simply said, “He (Lim) picked it for me so I just said “ok, I’d be happy to [wear it]!”–Michelle Ward

Courtesy Lacoste

Make a little room Josh Hartnett, James Franco and Justin Timberlake — there’s a new celebrity fragrance model on the rise. Lacoste has just announced that Hayden Christensen will be the face of their new scent, Challenge. And PEOPLE.com has a first look at the star’s sporty campaign. The altar-bound actor, who is engaged to Rachel Bilson, embodies the brand’s preppy spirit for the men’s fragrance which will launch in August. Check back for more details as they come in. Tell us: What do you think of Hayden as the face of Lacoste Challenge?

Gabriela Maj/Getty

Fashionistas everywhere envy Rachel Bilson’s effortless street style and always-chic red carpet looks. With the release of her first clothing line, Edie Rose for DKNY Jeans, back in September we got a little closer to her style secrets — but now Rachel is helping out even more. The style star has teamed up with InStyle to write a monthly column in which she’ll answer readers’ fashion questions — and share her must-have items. “I can talk about fashion all day long, and I am an avid InStyle reader so the relationship seemed perfect!” Rachel says. “This column is the best homework assignment ever!” In the star’s first column, which will appear in InStyle’s May issue, she gives advice on everything from how to wear scarves in warm weather, to how to pair a big bag with a cocktail frock. Rachel also talks about must-have flats, and includes affordable brands like Lela Rose from Payless. We can’t wait to see what she has to say each month! Check out InStyle’s May issue– on newsstands this Friday, April 24 — for Rachel’s first column. And if you have a style question for her, submit it at instyle.com/askrachel. Tell us: Will you read Rachel’s InStyle column?

Michael Williams/Startraks

Rachel Bilson may have spent a few years in the O.C., but she’s learned her lesson since days spent tanning at the beach as a teen. The star has teamed up with Jergens to promise to get her tan from a bottle this summer and help raise awareness for skin cancer research through the Glow in the Dark initiative. Rachel talked to PEOPLE.com about her involvement, explaining that “growing up in Southern California, getting tan was a big part of the culture. Now being aware of how bad [tanning] is for your skin, you can still get that look and that glow without harming your body.” Rachel’s favorites include the natural glow Foaming Daily Moisturizer and natural glow Healthy Complexion Daily Facial Moisturizer with SPF 20, which she loves because “you can put it on and you can wear it and be protected.” Click here to make your own pledge to stay out of the sun this summer — even better than just protecting your own skin health, Jergens will donate $1 to the Skin Cancer foundation for every pledge made.

Credit: Bauer-Griffin; GSI Media; Flynet

Not only did Rachel Bilson take a front-row seat at pal Brian Reyes’s show during N.Y.C. Fashion Week last Thursday, but she’s his best model on the streets of Los Angeles this week! The newly-engaged actress wore not one but three of Brian’s tops this week. First, she wore out his gray T-shirt with black layers, switching to his white T-shirt with Helmut Lang jeans the next day. She just keep going pairing her Brian Reyes marble-print top with a black vest and wide-leg pants. We’re loving her accessories too — check out her red Miu Miu purse and her green Chloe chain strap. No wonder Rachel is one of our favorites for her off-duty style savvy. Buy a Brian Reyes T-shirt for yourself at shopbop.com, $240.

Junko Kimura/Getty

We all have that one go-to product that we need to get out of the house in the morning. For example, Rachel Bilson can’t live without her La Mer face cream. “It’s a lot of money but you only need very little that goes a long way, so it lasts a really long time. It’s more of an investment. It really does [work],” Bilson tells PEOPLE. We want to know your beauty must-have! Tell us: In budget conscious times, what is the one beauty item you absolutely cannot live without? And what is the first thing that you would willingly give up?

flynet

Having Rachel Bilson as your maid of honor comes with some very fashionable perks. The fashionista joined forces with long-time friend and designer Brian Reyes to create four one-of-a-kind silk georgette and chiffon bridesmaid gowns in a soft range of greens for the wedding of her best friend Jill Stonerick to O.C. and Gossip Girl creator Josh Schwartz. Rachel, who just launched her first line Edie Rose with DKNY Jeans, has been wearing Brian Reyes both on and off the red carpet since he launched his ready-to-wear label in 2004. We think the delicate dresses were perfect for the outdoor ceremony — when do we get to buy one of these for ourselves? Tell us: What do you think of Rachel and Brian Reyes spin on bridesmaid dresses?

Courtesy Page Six Magazine

Rachel Bilson is already one of our biggest fashion crushes, and in this week’s Page Six Magazine, their cover girl reveals her own fashion inspirations — and dishes about her real-life loves. Rachel might count Coco Chanel as a favorite style icon, but she says that her own look is also inspired by someone a little closer to home: her mother, Janice. “Vintage is her love,” the actress tells the magazine. “She has a great eye, which I think I inherited from her.” Part of Rachel’s sartorial success is a willingness to take risks and follow her instinct — no matter what others say. “I think it’s cool to be on the worst-dressed list,” she says. “If people aren’t accepting, that’s OK. Bring it on, I don’t care!” With a DKNY design collaboration coming out this fall, Bilson is turning her attention back to acting, including a role in the upcoming film New York, I Love You, which she stars in with boyfriend Hayden Christensen, another of her passions. “I have someone really great,” she says of the Star Wars star. “Someone who can make me laugh — that’s always what comes first. It’s the best to be able to really, like, truly laugh with someone like they’re your best friend, you know?” As for past love, O.C. costar Adam Brody, Bilson says, “They say don’t date your costar, but that’s who you’re around. If you’re in an office, and you see someone everyday and you click well, you’ll start dating. It’s the same thing.” Hear more from Rachel online Monday at pagesixmag.com

Steve Granitz/WireImage; INF; Steve Granitz/WireImage

Rachel Bilson, Scarlett Johansson and Kristen Bell might have completely different looks, but one thing they all have in common is their stylist Nicole Chavez. For Sunday night’s Teen Choice Awards, Nicole tells PEOPLE, “I wanted a very casual, fun, young vibe — I was gravitating towards really soft palettes,” for all her clients. Rachel was Nicole’s first client four years ago when they met on the set of The O.C. and Bilson encouraged her to start styling. Rachel, who won for Teen Choice Movie Actress Action Adventure for her thriller Jumper, wore a blue one-shouldered Brian Reyes dress (someone that Rachel “loves working [with]“). Of her longtime client, Nicole says, “Rachel is very natural with fashion. She’s not afraid to wear something that is a little different or unexpected.” Kristen Bell “immediately gravitated” to her Jenni Kayne hot pink skirt and nude cami. Of the look, Nicole says, “The color combo’s great. It’s super modern, cute. Perfect for Teen Choice.” For Scarlett, it was a Matthew Williamson chiffon dress with a burst of colors on the beaded shoulders, but, says Nicole, “The real statement will be about the jewelry. It’s fun to layer things and be more bold.” All the pieces were from Scarlett’s friend jewelry designer Sonia Boyajian, who designed her engagement ring. Like Rachel, Nicole says Scarlett isn’t afraid of a fashion risk. We love all Nicole’s girls’ looks. Tell us: Who was your favorite– Rachel, Kristen or Scarlett?

Courtesy DKNY

Gearing up to release her first line, Edie Rose for DKNY Jeans, Rachel Bilson strikes a pose for the line’s chic ad campaigns. In the actress’s first foray into design, she takes center stage to promote the juniors sportswear line in a chic black belted dress and funky vest. Just like in her everyday wear, Rachel seems to have combined her California cool fashion sense with an edgier runway sensibility. We can’t wait to see more when the collection is hitting stores like Macy’s, Dillard’s and Nordstrom in September. Tell us: What do you think of Rachel’s new ads? Are you excited for her line to come out?

Daniel/INF

Hair changes have abounded in Hollywood over the past couple weeks with Selma Blair trading her short do for long locks, brown-haired Lily Allen lightening up — and even iconic California-blonde Kate Hudson feeling blue. And now we can add Rachel Bilson to the list of hair-swapping celebs. We spotted the star on the set of her new film New York, I Love You in this shoulder-length blond bob that’s a decided departure from her usual darker look. And even though it’s probably just a wig, we love seeing such a drastic change! Who knew Rachel would look so good as a blonde? Tell us: Do you think Rachel should go blonde for real? Or should she stick with her natural color?

Specker /Landov; Raglin/WireImage; INF

Lately, it’s felt like every star is hopping on the bandwagon to start their own clothing line — from Matthew McConaughey to Heidi Montag, the list is getting never ending. But several style icons tossed their names into the ring last week, and they’ve got us wondering whose line will be most successful in the end. Lindsay Lohan, who’s designing a line of leggings, is known for her casual cool and red carpet sex appeal, while Rachel Bilson (who’s teaming up with DKNY Jeans) has impeccable street style and understated evening looks. And Avril Lavigne, who will be designing a junior’s line for Kohl’s, has made her girly-punk mix unmistable. Now we want to know whose line you’d buy! Tell us and vote in our poll below.

Junko Kimura/Getty

The Jumpers actress is the latest celeb to add fashion designer to her list of accomplishments. Teaming up with DKNY Jeans, Rachel Bilson will be designing a juniors sportswear line that includes everything from jackets, dresses and jeans to knits. WWD reports the former O.C. star has been looking for a company to collaborate with for awhile and settled on DKNY Jeans for her Edie Rose line because her fans really like the brand. Rachel Bilson has long since been one of our favorite fashionistas, wowing us with glamorous red carpet dresses and enviable street style. We cannot wait to see what she has in store for her own line– maybe some California cool mixed with quirky high fashion? Rachel’s complete line will hit major department stores such as Macy’s, Dillard’s and Nordstrom in September 2008. Tell us: Will you buy Rachel’s Edie Rose for DKNY Jeans line?

Junko Kimura/Getty

Though Rachel Bilson isn’t afraid to try anything when it comes to fashion, the actress hasn’t been so daring when it comes to her hair. Known for her signature long dark straight locks, the actress shook it up a bit with a blunt bang cut — just like Kate Moss. And is it just us or does her hair seem a little lighter too? We think the bangs will take some getting used to, but if Kate Moss could pull it off, our favorite America fashionista certainly can. Tell us: What do you think of Rachel’s new bangs? Do you love them or hate them?

Walter Weissman

Did you know that one third of all homeless people are under the age of 18? DoSomething.org and Aeropostale are encouraging more fortunate teens to help their peers. Together, they have teamed up to create “Teens for Jeans”, a campaign that helps young people donate their gently used jeans to homeless teens across the country. Celebrities like Rachel Bilson, Chad Michael Murrary, Hayden Christensen, Hilarie Burton and more have come together to sign used pairs of jeans to donate to homeless teens. Watch Rachel’s PSA and learn more about the campaign at Teensforjeans.com. You can help by dropping off your jeans at one of the 800 Aeropostale locations across the US and Canada starting January 22nd (drive ends Feb. 10th) in exchange for 20% off your next pair of jeans at Aeropostale.

Jennifer Buhl/Pacific Coast News; NPG

Rachel Bilson has been easing into the cold weather with the cutest jackets. We covet just about anything Rachel wears, and these two jackets are no exception. Her Hanii Y camel balloon sleeve coat is just perfect for topping of jeans or even a cute dress at night, while her Burberry grey double-breasted short coat is a great alternative to a traditional pea coat. We found Rachel’s coat and a few looks for less!

Get Rachel’s Coats!
For Real:
Burberry Peat Mottled Wool Cashmere Cropped Double-Breasted Jacket, $1895, at Burberry Stores

Hanii Y High Neck Balloon Sleeve Jacket, $467, at shopbop.com

For a Steal:
Marc New York Double-Breasted Coat With Stand-Up Collar, on sale $290, macys.com

ASOS Double-Breasted Belted Coat, on sale $100, ASOS.com

Belted Double Breasted Black bell Sleeve cropped coat, $168, bebe.com

Guess Three-Quarter Sleeve Cropped Coat, $108, macys.com