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!
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?