The Vampire Diaries actress looked fab in a J. Mendel dress, Jimmy Choo shoes, a Kotur clutch and Coomi jewelry.
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Selena Gomez
The "Hit the Lights" singer looked pretty in pink in a Dsquared2 dress, Herve Leger heels and Lana jewels.
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Demi Lovato
The evening's co-host looked fashion-forward in a Falguni + Shane Peacock dress and Christian Louboutin heels.
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Lea Michele
The Glee starlet showed off her long legs in a Versace dress, Versace shoes, a Marchesa bag and Stephen Webster jewels.
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Zoe Saldana
The Words actress stopped traffic in midriff-baring Jonathan Saunders ensemble and Tiffany & Co. jewels.
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Taylor Swift
The "Both of Us" singer selected a Maria Lucia Hohan dress, Prada heels, Lorraine Schwartz jewels and an Edie Parker clutch.
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Hayden Panettiere
The Nashville actress turned heads in a Zuhair Murad dress, B by Brian Atwood shoes and a Judith Leiber bag.
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Victoria Justice
The Nickelodeon star accessorized her Gomez-Gracia dress with Lauren Merkin's rectangular hard-case clutch, Schutz jewels and an EFFY bangle.
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Zooey Deschanel
The New Girl actress wore a Monique Lhuillier dress and carried a Jimmy Choo clutch.
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Shay Mitchell
The Pretty Little Liars actress looked sensational in a Donna Karan Atelier dress and Camilla Skovgaard pumps. She also carried a Jimmy Choo bag.
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Nikki Reed
The Twilight Saga: Breaking Dawn - Part 2 actress wore a corset top and skirt by Contrarian New York. She completed her look with Brian Atwood heels.
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Miranda Cosgrave
The iCarly star shined in a Collette Dinnigan dress, Stella McCartney shoes, a Judith Leiber purse and Stephen Webster jewelry.
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Carly Rae Jepsen
The "Call Me Maybe" singer wore an ivory blazer and shorts with palm tree print detail by Lisa Ho, which she paired with a Kate Spade New York clutch and Aldo platform pumps.
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Kat Graham
The Vampire Diaries actress and "Put Your Grafitti on Me" singer wore an eye-catching Mara Hoffman open-back column dress and Gio Diev pumps.
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Lucy Hale
The Pretty Little Liars star looked red hot in a Wes Gordon dress, Brian Atwood shoes, Jimmy Choo stingray clutch, Bang Bang gold spike stud earrings and Giles and Brother bracelets.
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Kristen Stewart
The Twilight Saga: Breaking Dawn - Part 2 actress wore head-to-toe Roberto Cavalli.
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Kylie Jenner
The E! reality star wore a burgundy mini-dress with cut-out details.
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Jordin Sparks
The Sparkle star showed off her 50-pound weight loss in an embroidered Chagourey Couture dress and Prada shoes.
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Holland Roden
The Teen Wolf actress wore an Alice + Olivia by Stacey Bendet cocktail dress and a Lauren Merkin handbag.
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Tamera Mowry
The mom-to-be showed off her pregnancy curves in a black-and-white Rachel Pally dress, Tresor earrings and Luichiny Lights Out pumps.
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Chelsea Kane
The Baby Daddy actress donned a French Connection white silk blouse with yellow beaded sleeves and Alice + Olivia shorts.
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Hannah Simone
The New Girl actress wore a Mary Katrounzou dress, an H. Stern Ring and JustFab shoes. She carried a Tory Burch purse.
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Troian Bellisario
The Pretty Little Liars star looked sexier than ever in a Maria Lucia Hohan bodysuit and skirt, Adeler earrings and Rene Caovilla heels.
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Ellen DeGeneres and Portia de Rossi
The talk show host kept it casual in white pants, a blazer and a red, white and blue belt, while her actress wife showed off her sexy stems in fitted shorts and a flowy top.
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Kendall Jenner
The teen model wore a one-shoulder black cocktail dress with lace trim.
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Debby Ryan
The Disney Channel star wowed in a Bibhu Mohapatra dress, an Edie Parker clutch and Chanel heels.
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Cat Deeley
The So You Think You Can Dance? host wore silver pants with a black top and matching heels.
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Candice Accola
The Vampire Diaries actress wore a sunny 3.1 Phillip Lim dress.
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Ashley Benson
The Pretty Little Liars star vamped it up in a Monique Lhuillier top, Balenciaga pants and Jimmy Choo heels.
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Bella Thorne
The Disney Channel starlet donned an ensemble by AllSaints Spitalfields.
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Tia Mowry
The Style Network reality star wore a lacy yellow Chagoury dress and satin Alexandre Birman pumps.
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Crystal Reed
The Teen Wolf actress wore a Marchesa dress, Stuart Weitzman heels and David Yurman earrings.
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Meagan Good
The newlywed showed off her toned tummy in a snakeskin print ensemble.
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JoJo
The "Sexy to Me" singer wore a curve-hugging Marco Marco skirt, Christian Louboutin heels and Micha Design jewelry.
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Kathryn McCormick
The Step Up Revolution dancer and actress wore a nude mini dress.
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Rebecca Black
The "Friday" singer paired an orange and white top with a black skirt.
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