Daniel Radcliffe attended the 2012 Met Ball (Costume Institute Gala), which debuted the opening of the "Schiaparelli and Prada: Impossible Conversations" fashion exhibit at the Metropolitan Museum of Art, in New York City on Monday evening, accompanied by former How to Succeed in Business Without Really Trying costar Rose Hemingway. Photos of the pair on the red carpet at the event can be seen below.









UPDATE: Dan's former Harry Potter costars Gary Oldman (Sirius Black) and Helen McCrory (Narcissa Malfoy) were also in attendance; photos of the two with their spouses can be found here.