Newlywed and Met Ball co-chair Carey Mulligan is auctioning off her custom Prada halter dress on eBay all for a good cause. With one hundred percent from the final bid going to Oxfam America, an international organization that fights poverty around the world, Mulligan’s gold and silver paillettes gown will do more than just make a fashion statement. The petite frock (sized 38-40), which topped our best dressed lists, starts at $500 US and will close in just 9 days on May 19. Now’s your chance to own a one-of-a-kind Prada worn by an Oscar nominated actress from one of fashion’s biggest events of the year. To us, that’s a worthy investment!