Singer Justin Bieber holds up a belt for Floyd Mayweather Jr. before Mayweather Jr. takes on Miguel Cotto during their WBA super welterweight title fight at the MGM Grand Garden Arena on May 5, 2012 in Las Vegas, Nevada.

Singer Justin Bieber and rapper Curtis '50 Cent' Jackson enter the ring with Floyd Mayweather Jr. before Mayweather Jr. takes on Miguel Cotto during their WBA super welterweight title fight at the MGM Grand Garden Arena on May 5, 2012 in Las Vegas, Nevada.

(L) Singer Justin Bieber holds up a belt for Floyd Mayweather Jr. before Mayweather Jr. takes on Miguel Cotto during their WBA super welterweight title fight at the MGM Grand Garden Arena on May 5, 2012 in Las VegNevadaas,