Tons of A-listers showed up at the Metropolitan Museum's Costume Institute Gala in NYC last week, including Hilary Duff and Fergie. The starlets posed prettily before checking out the new "Superheroes: Fashion and Fantasy" exhibition, and the two of them looked great! Other dressed up celebs weren't so stylin', though. Check our slideshow of gowns, and vote on who deserves Worst Gala Getup!

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