The singer — who announced her pregnancy on the red carpet — wore a Lanvin dress and Lorraine Schwartz jewels.
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Britney Spears
The Best Pop Video winner wowed in a sequined Moschino romper and black Gina booties.
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Lady Gaga
The "You and I" singer wore Brooks Brothers pants with a Uniqlo t-shirt, a Dior Homme jacket and Doc Martens.
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Katy Perry
The "Teenage Dream" singer looked adorable in an Atelier Versace dress, Jimmy Choo shoes and Lorraine Schwartz jewels.
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Demi Lovato
The "Skyscraper" singer donned a sparkling Mandalay mini-dress and Christian Louboutin platforms.
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Nicki Minaj
The "Super Bass" rapper's over-the-top look consisted of an Amato Couture pink corset, Shojotomo Japan shorts, thigh highs and critter socks, Tsimori Chisato stockings, an Onch Movement ice cream necklace, Fifi and Romeo plastic cuffs and Duepunti rings.
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Miley Cyrus
The "Can't Be Tamed" singer wore a backless Roberto Cavalli dress, Azzedine Alaia shoes and Lorraine Schwartz jewels.
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Kim Kardashian
The newlywed wore a metallic Kaufman Franco gown.
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Katie Holmes
The Don't Be Afraid of the Dark actress stopped traffic in an Azzedine Alaia halter dress and Proenza Schouler booties.
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Zoe Saldana
The Colombiana actress dazzled in a leather Barbara Bui dress and Barbara Bui shoes.
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Nicole "Snooki" Polizzi
The Jersey Shore star showed off her slim new figure in a body-hugging Ema Savahl mini-dress with crystal embellishments.
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Selena Gomez
The "Love You Like a Love Song" singer oozed dark glamour in a Julien Macdonald dress, Brian Atwood heels, a Judith Leiber clutch and Ofira jewelry.
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Adele
The "Rolling in the Deep" singer looked demure in Burberry.
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Jenni "JWoww" Farley
The Jersey Shore star vamped it up in a plunging Jovani mini-dress and strappy sandals.
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Kelly Rowland
The "Motivation" singer sizzled in a Falguni & Shane Peacock dress and Christian Louboutin heels.
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Crystal Reed
The Teen Wolf actress wore an AllSaints outfit with Stuart Weitzman shoes and Lauhla by Misa jewels.
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Maria Menounous
The TV host brightened up in an Amanda Wakeley dress, Giusseppi Zanotti heels, a Lana Marks clutch and XIV Karats Beverly Hills jewelry.
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JoJo
The singer channeled gothic glamour in a Marco Marc dress, Penelope & Coco platforms, earrings and a ring by Elodie K., a ring from Philip Press and a cuff from Soffer Ari.
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Sammi "Sweetheart" Giancola
The Jersey Shore star wowed in a one-shoulder Alberto Makali minidress.
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Victoria Justice
The Nickelodeon star turned heads in a THEIA dress, Rock and Republic shoes, an Elie Tahari clutch and jewelry by Phillip Press and 88 by Sandy Simonian.
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Deena Nicole Cortese
The Jersey Shore star sparkled in a sequined GG Fashions mini-dress.
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Kreayshawn
The rapper wore a sequined Mickey Mouse dress and red sneakers.
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