It's prom for Hollywood's A-list — so why on Earth would you show up in a matronely, black floor-length funeral dress (Mary Kate Olsen) or Halloween colors (Eva Mendes) or shapless sack and shorts (Anne V.).

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Our sentiments exaclty, but perhaps Kristen Stewart, Chloë Sevigny, Kirsten Dunst and the rest of last night's mishaps really thought they were pushing fashion's envelope on the red carpet in outfits that were less than thrilling.

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Who do you think was the worst dressed?