Last Night's Look: Hit or Miss?

Vote on this week's styles including Kate Moss, Jessica Simpson, Leighton Meester and more stars! You decide – are they fashionistas or flops?

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RIHANNA

First straight, now curly! The singer pairs her new do with a one-shoulder Elie Saab Haute Couture gown and nude heels backstage at the American Music Awards in L.A.