Carey Mulligan auctions Met Ball Prada dress for charity

The Met Ball is one of the biggest nights on the fashion calendar -- and Academy Award nominated actress Carey Mulligan rocked an incredible fish-scale Prada dress. Covered in giant gold and silver paillettes, the halter-neck dress was one of the best-reviewed at the event, which is hosted by Vogue editor Anna Wintour and attended by basically every star on Earth, including Rihanna, Kanye West, and Sofia Vergara. Mulligan wore Prada to honor designer Miuccia Prada, whose work is the focus of an exhibition at the Metropolitan Museum of Art celebrating her and Elsa Schiaparelli. Now on eBay, the "pre-owned" dress is (at the moment) just over $1500 -- and 100 percent of the money raised will benefit the U.K. charity Oxfam.