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Vote on this week's styles from Mary-Kate Olsen, Rihanna, Blake Lively and more stars! You decide – are they fashionistas or flops? By Melissa Liebling-Goldberg
Credit: Jeffrey Mayer/Wireimage
Updated: Friday Feb 29, 2008 | 11:35 AM EST
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Leaving her bold red gown behind, the Project Runway host sizzles in a Roberto Cavalli silver sequined minidress at Elton John's afterparty.
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