Singer Rihanna poses as she arrives at the Metropolitan Museum of Art Costume Institute Benefit celebrating the opening of the "Schiaparelli and Prada: Impossible Conversations" exhibition in New York, May 7, 2012. [Photo/Agencies]

Singer Rihanna arrives at the Metropolitan Museum of Art Costume Institute Benefit celebrating the opening of "Schiaparelli and Prada: Impossible Conversations" exhibition in New York, May 7, 2012. [Photo/Agencies]