The “Skyscraper” singer brightened up in a BCBG Max Azria dress and Christian Louboutin heels.
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Blake Lively
The Gossip Girl actress looked stunning in a Gucci dress, Christian Louboutin heels and Lorraine Schwartz jewels.
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Fergie
The Black Eyed Peas singer oozed sex appeal in a Dolce & Gabbana mini and Christian Louboutin heels.
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Selena Gomez
The "Love You Like a Love Song" singer rocked an Erin Fetherston dress, Brian Atwood heels, a M.C.L. By Matthew Campbell Laurenza miniaudiere, an H.Stern ring and Carla Amorim earrings.
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Cameron Diaz
The Bad Teacher actress showed off her killer legs in an ALC dress, Burakuyan shoes, a Chloe clutch and Vherrier rings.
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Kim Kardashian
The bride-to-be looked elegant in a Givenchy dress, Christian Louboutin heels, a Bottega Veneta clutch and Lorraine Schwartz jewels.
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Emma Stone
The Help star shimmered in a Dior dress, Lanvin shoes, an Alexander McQueen clutch and Irene Neuwirth jewels.
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Elizabeth Banks
TheHunger Games star looked red hot in a J. Mendel dress and an Edie Parker clutch.
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Taylor Swift
The "Story of Us" singer looked adorable in a Raphael Cennamo dress, a Ranjana Khan belt, Fendi shoes and Neil Lane jewels.
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Zoe Saldana
The Colombiana actress paired her Lanvin dress with Alexander McQueen shoes, a Salvatore Ferragamo clutch, Jamie Wolf bangles, Lana earrings and a Carla Amorim ring.
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Ashley Greene
Greene -- who next appears in The Twilight Saga: Breaking Dawn -- wore a Givenchy dress, Givenchy shoes and Neil Lane jewels.
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Nina Dobrev
The Vampire Diaries star wowed in a D&G dress, Ferragamo heels, a Dolce & Gabbana clutch and Ippolita jewels.
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Rachel Bilson
Hart of Dixie's Bilson paired a Chloe dress with studded Brian Atwood booties.
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Avril Lavigne
The singer-turned-designer rocked head-to-toe Abbey Dawn.
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Kourtney Kardashian
In a Blaque Label dress, Christian Louboutin shoes, a Chanel clutch and Loren jewels
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Lucy Hale
The Pretty Little Liars star sparkled in a glittery Cengiz Abazoglu mini, Giuseppe Zanotti platforms and David Yurman drop earrings.
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Nikki Reed
The newly engaged Twilight actress looked summery in an Etro dress and a Ferragamo clutch.
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Kaley Cuoco
The Big Bang Theory actress (who hosted the show) stunned in a Rebecca Taylor dress and Neil Lane jewels.
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Khloe Kardashian
The E! reality star went wild in a Roberto Cavalli dress, Jimmy Choo shoes, a Salvatore Ferragamo clutch and Loren jewels.
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Shay Mitchell
The Pretty Little Liars star wowed in a DKNY shirt and a DKNY skirt.
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Tyra Banks
The supermodel-turned-author sported a Thierry Mugler leather jumpsuit.
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Zooey Deschanel
The New Girl star looked dainty in head-to-toe Miu Miu.
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Raven Symone
The actress showed off her trim figure in a black blazer, capri pants and platform heels.
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Maggie Q
The Nikita star looked white hot in a Max Mara skirt, a Max Mara body suit and Aperlai shoes.
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Kat Graham
The Vampire Diaries actress wore an embellished white mini with fringe details.
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Ashley Benson
The Pretty Little Liars star donned Alice + Olivia by Stacey Bendet and Ruthie Davis peep-toe wedges.
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Kendall Jenner
The E! reality star looked all grown up in an Aurelio Costarella dress, YSL shoes, a Kotur clutch and a Ted Rossi ring.
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AnnaSophia Robb
The Soul Surfer actress looked adorable in a one-shoulder Malandrino mini.
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Crystal Reed
The Teen Wolf actress wore a Lanvin dress and Aldo heels.
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Kylie Jenner
The Keeping Up With the Kardashians star looked darling in a BCBGeneration dress, BCBG shoes and a Raven Kauffman Couture clutch.
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Cat Deeley
The So You Think You Can Dance host was a breath of fresh air in a mint blue lace dress with nude stripy sandals.
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Rebecca Black
The "Friday" singer donned a one-shoulder ultraviolet dress.
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