Nicki Minaj (left) and Madonna perform during the halftime show at the Super Bowl in February. In a song from Madonna's new album, MDNA, the two singers each play with traditionally feminine and masculine gender roles. Rob Carr/Getty Images hide caption

itoggle caption Rob Carr/Getty Images

Madonna (center), flanked by Nicki Minaj and M.I.A., during a performance of her new single "Give Me All Your Luvin'" during the Bridgestone Super Bowl XLVI Halftime Show in Indianapolis. Christopher Polk/Getty Images hide caption

itoggle caption Christopher Polk/Getty Images