Fancy Fashion Face-Off: Ashley Olsen vs. Mary-Kate Olsen

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Following an evening of incredible fashion at the Costume Institute Gala at The Metropolitan Museum of Art last night, we've been matching up celebrities in a series of fashionable face-offs.

And no relationship is safe from this competition!

Mugler Shot

Gossip Girl co-stars Leighton Meester and Blake Lively were pitted against one another earlier in the day... but that's nothing compared to the match-up below!

Sisters Ashley Olsen and Mary-Kate Olsen were spotted on the red carpet, each at her thin, unfashionable best. Compare the siblings below and then vote in our poll:

Who looks better?

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