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Vote on this week's styles from Katie, Demi and 40 more stars! You decide – are they fashionistas or flops? By Melissa Liebling-Goldberg
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Updated: Friday Feb 22, 2008 | 11:50 AM EST
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The singer arrives in a gold Michael Kors dress to Saks Fifth Avenue's Unforgettable Evening benefiting EIF's Women's Cancer Research Fund – but later changed into a black pantsuit for her blockbuster performance.
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