LAS VEGAS, NV - MAY 05:  Singer Justin Bieber, Rapper Lil Wayne, boxer Floyd Mayweather Jr., rapper Curtis '50 Cent' Jackson and Yuriorkis Gamboa pose after Mayweather Jr. defeats Miguel Cotto by unanimous decision in their WBA super welterweight title fight at the MGM Grand Garden Arena on May 5, 2012 in Las Vegas, Nevada.  (Photo by Al Bello/Getty Images)