This year's Met Gala attendees gave us good reason to think two outfits are better than one. And who can blame Ashley Greene for trading her dramatic Marchesa gown for something a little shorter come afterparty? Those iconic Met stairs (read: not ornate-dress friendly) alone could prompt an outfit change, but we think it gives this A-list set another chance to show off one more great look before night's end. Case in point: Allison Williams's surprising dark and sexy twofer, courtesy of Altuzarra. Or how about Madonna's Givenchy Haute Couture tartan and fishnets getup that turned into just fishnets all over? The beauty of seeing fashion's finest is actually seeing them at their finest, and that means outfit changes galore. Which stars were bona fide Met Gala quick-change artists? Find out right this way.