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zoe saldana

In an RM by Roland Mouret gown at the Avatar premiere in London last December.

In an RM by Roland Mouret dress and Louboutin caged booties in L.A. in April.

In Givenchy Haute Couture at the Oscars in March.

In Calvin Klein at the label's fashion show in Berlin in July.

GET ZOE'S STYLE!

AMRITA SINGH Gold-flecked hoop earring, $75; banglebangle.com

Lauren by Ralph Lauren Damaris one-shoulder dress, $124; macys.com

NINE WEST Noletta caged bootie, $99; ninewest.com

ETTIKA Ancient-weathered disc ring, $40; ettika.com

THE RED-CARPET QUEEN

Bringing grace, taste and a sense of fun to entrance-making events, the former ballerina, 32, stands out from the crowd. And she happily stands her ground when the opinion is divided. Her love-it-or-hate-it Givenchy Oscar gown, for example, made her feel "strong and unique," she says. Now the face of Calvin Klein lingerie, Saldana moves easily from clean lines to dramatic ones. "I like everything," she says. "I go by my mood."

gwen stefani

In a black L.A.M.B. jacket, bag and shoes at LAX airport in L.A. in May.

In a wrap sweater and boyfriend jeans in Beverly Hills in February.

GET GWEN'S STYLE!

FOREVER 21 Faux Leather Jacket, $39.80; forever21.com

MAKE UP FOR EVER Rouge Artist Intense lipstick in #43 Moulin Rouge, $19; sephora.com

BCBG MAX AZRIA "Alynna" platform sandal, $325; BCBG Max Azria stores

L.A.M.B. "Ramson" large satchel, $348; Bloomingdale's stores

THE HIP MOM

The pop star exudes avant-garde style, even on the playground with sons Kingston, 4, and Zuma, 2, rocking her own take on trends like harem pants and motorcycle jackets. "I'm always wearing evolutions of the same thing," says Stefani, 40. The L.A.M.B. designer's trick for instant glam: "Try red lipstick-once you do it, you never go back!"

rihanna

In Stella McCartney in N.Y.C. in August.

In a basic tank, chunky gold jewelry and an Army-fatigue skort in N.Y.C. in September 2009.

GET RIHANNA'S STYLE!

GIRLPROPS Double-link chain, $21.99; girlprops.com

XOXO Velvet dress with lace yoke, $69.00; xoxo.com

GIRL PROPS Set of three wrapped bangles, $6.99; girlprops.com

ALL SAINTS Suede Vala stiletto with corseting detail, $210; us.allsaints.com

THE DARING DIVA

Known for pushing the fashion envelope as far as it goes, the 22-year-old Barbadian beauty loves mixing high and low labels and celebrates her curves with body-hugging silhouettes. "Rihanna does not take herself too seriously. She has fun with her style," explains her hairstylist Ursula Stephens, adding, "Rihanna is willing to try anything, as long as it makes her feel beautiful. If it makes her feel beautiful, it's a go!"

diane kruger

In a Lanvin dress, belt, clutch and shoes at the National Movie Awards in London in May.

In Karl Lagerfeld at a Sherlock Holmes premiere in Berlin in January.

GET DIANE'S STYLE!

TWENTY8TWELVE "Boston" dress in Tarnished, $499; twenty8twelve.com for stores TREESJE "Lita" belt in Berry, $178; treesje.com and TREESJE "Mini Penny" belt in Luggage, $215; Kitson, 800-814-8447

LA REGALE Silver mesh clutch, $98; at select Bloomingdale's stores

BOUTIQUE 9 "Marnie" over-the-knee boot, $300; blooming dales.com

THE RUNWAY RENEGADE

German actress Diane Kruger, 34, is a favorite of designers such as Karl Lagerfeld and Jason Wu, who reserve front-row seats for her at their fashion shows. The former model, who often does her own makeup and styling, always puts style before function. "Who cares about comfort on the red carpet?" she says. "It's such an unnatural environment for that! I want to feel special and fabulous at such an event!"

lea michele

In Zac Posen at the Tony Awards in Manhattan in June.

In Catherine Malandrino at the Screen Actors Guild Awards in L.A. in January.

In Nuj Novakhett at the People's Choice Awards in L.A. in January.

In Zac Posen at the Nickelodeon Kids' Choice Awards in L.A. in March.

GET LEA'S STYLE!

T. CYIA Gold-plated and Swarovski earrings; $162.50, tcyia.com for stores

FOREVER 21 Woven strapless minidress; $27.80, select forever21 stores nationwide

SHOP4SPARKLES Lacquer bangle set; $15 for two, shop4sparkles.com

CALVIN KLEIN Platform pump; $129, select Bloomingdale's stores

In Isaac Mizrahi at the Fox Winter All-Star Party in Pasadena in January.

THE NEWBIE

Since joining pop-culture phenom Glee last year, 24-year-old Lea Michele has quickly become a red-carpet must-see. The overnight "it" girl isn't afraid to adorn her petite frame with eye-catching color. "Lea gravitates to bold shades, and it's easier to pull those off without a busy pattern," notes her stylist Estee Stanley. Michele wears sexy yet tasteful dresses in scarlet, tangerine and emerald. "She loves wearing Oscar de la Renta and Giambattista Valli," says Stanley. "She's also open to wearing new designers; she likes to keep her look young and fresh."

olivia palermo

In Swarovski necklace, lace top and Topshop leather skirt in N.Y.C. in November 2009.

In a Diane von Furstenberg blouse, fringe skirt and Hermes Birkin bag in Berlin in July.

GET OLIVIA'S STYLE!

AMRITA SINGH "Wainscott" necklace, $100; amritasingh.com

MICHAEL MICHAEL KORS Large Hamilton tote, $298; michaelkors.com

H&M Leather skirt, $99; hm.com for stores

WANTED "Rake" skimmer, $34.99; endless.com

THE UPTOWN GIRL

Called the queen of street style by the British fashion press, the New York City socialite and star of The City has a knack for customizing her clothes. She redrapes dresses and wears statement necklaces and cocktail rings for a modern twist. When shopping, "I look for quality, color and that it's versatile," says Palermo, 24. Adds designer Rebecca Taylor: "Olivia's style is effortlessly chic."

jessica alba

In a plaid Prada mini and Miu Miu booties at the Valentine's Day premiere in London in February.

In a Louise Goldin skirt and sparkly leggings at the MTV Movie Awards in L.A. in June.

GET JESSICA'S STYLE!

KARA BY KARA ROSS Braided snake-knot necklace, $230; maxandchloe.com

TRACY REESE Deep water contrast frock, $249; tracyreese.com

XHILARATION FOR TARGET "Lauren" lace leggings, $16.99; target.com for stores

POUR LA VICTOIRE "Lonlee" bootie, $385; piperlime.com

THE MIX MASTER

The power of Alba's style is in the mix. She combines casual with dressy, fancy with funky and high-end with low cost. "My taste is pretty eclectic," says the actress, 29, who adds, "being comfortable is always a priority." She also has two secret weapons. "The most important thing is fit," says her stylist Daniel Caudill. "Jessica is in great shape." Also fearlessness. "My theory," says Alba, "is that if you look confident, you can pull off anything."

jennifer aniston

In a Valentino gown and Fred Leighton jewels at the Golden Globes, in L.A. in January.

In a Donna Karan gown at The Bounty Hunter's N.Y.C. premiere, in March.

In a silver Valentino minidress at the London premiere of The Bounty Hunter, in March.

In a sheath paired with Gucci peep-toe pumps at a photo call in Madrid, in March.

GET JENNIFER'S STYLE!

SWAROVSKI Last pierced earrings, $90; swarovski.com

MOSSIMO FOR TARGET Tuxedo jacket, $24.99; target.com

ALICE + OLIVIA "Cara" cap-sleeve sequin dress, $396; aliceandolivia.com

STUART WEITZMAN "Hiturn" evening sandal, $325; bloomingdales.com

In a Valentino dress at her fragrance launch in London in July.

THE AMERICAN CLASSIC

When it comes to capturing timeless style on the red carpet, Aniston, 41, knows how to stop the clock. You won't often catch her sporting flashy patterns-instead, the Switch star gravitates toward all things neutral. Whether it's a figure-hugging sheath or a dress slit up to there, she highlights the smoking-hot body that she works hard to maintain. When asked how she stays fit, she told Good Morning America in an understatement, "I work out regularly [she does serious yoga] and I eat well, and I think sleep is important."

rachel bilson

In Paige Denim Skyline Ankle zip jeans in L.A. in February.

In AG Adriano Goldschmied boyfriend jeans in L.A. in March.

GET RACHEL'S STYLE!

TREESJE "Asher" mini, $498; endless.com

RAY-BAN Wayfarer, $119.95; sunglasshut.com

AMERICAN EAGLE OUTFITTERS Boy fit crop, $49.50; ae.com

MIZ MOOZ "Rain" clogs, $94.99; infinityshoes.com

THE DENIM DARLING

She makes it look easy, but Bilson, 29, thinks strategically when she puts on her jeans: "Always my go-to item when I'm getting dressed." She picks styles that flatter her slim shape and pairs even the most distressed denim with classic tops and accessories. "Jeans make me feel comfortable," she says. "When I'm comfortable, I'm happy." Fave brands: Paige Premium Denim and AG Jeans. "They have the best wash and fit."

kate middleton

In an embroidered coat at a U.K. wedding in May.

In a red Issa London dress at a U.K. wedding in April.

GET KATE'S STYLE!

PHILIP TREACY Feather flower headdress, $509; for more information visit philiptreacy.co.uk

ISSA LONDON Silk jersey dress; visit issalondon.com for more information

LA REGALE Satin clutch with rhinestones, $78; at select Bloomingdale's stores

KATE SPADE Suede pumps with patent heels, $275; at select Bloomingdale's stores

THE PRINCESS IN WAITING

All eyes are on Kate Middleton as the world awaits inevitable news-and the 28-year-old beauty rises to the occasion with her wardrobe choices. Always proper with a dash of panache, she "looks chic and refined," says Daniella Helayel, of Issa London, one of Middleton's favorite labels. "She favors classic silk jersey dresses. She has wonderful taste that I don't believe will change when she becomes a royal."

  • Contributors:
  • CONTRIBUTORS Bridgette Bartlett,
  • Alexis Chiu,
  • Rennie Dyball,
  • Jackie Fields,
  • Marisa Laudadio,
  • Samantha McIntyre,
  • Lesley Messer,
  • Thailan Pham,
  • Suzanne Zuckerman,
  • with Andra Chantim,
  • Kate Hallett,
  • Monique Jessen,
  • Julie Jordan,
  • Zara Kessler,
  • Blaine Zuckerman.