Celeb Fashion Hit or Miss?

Vote on this week's styles including Sienna Miller, Julia Roberts and more stars! You decide – are they fashionistas or flops? By Melissa Liebling-Goldberg

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FERGIE

Although a fan of Cartier, the singer tells PEOPLE that her favorite piece of jewelry is her engagement ring from fiancé Josh Duhamel – which goes nicely with her art-print Derercuny minidress and Jimmy Choo gladiator sandals.