Celebrity guests: Whitney Houston, Dustin Hoffman, Dan Aykroyd, Howard Cosell, Billy Crystall, Tony Danza, Sugar Ray Leonard, The Pointer Sisters, Little Richard, Diana Ross, Nelson Mandela and many more !_______________________________________________________________________________tags: muhammad ali 50th birthday celebration sugar ray robinson leonard benny willie pep henry armstrong roberto duran tribute documentary tommy hearns roberto duran sugar ray leonard mike tyson iron boxing boxer muhammad ali amir khan zab judah manny pacquiao pacman floyd mayweather david haye wladimir klitschko klitchko vitali joe louis whitney houston dustin hoffman dan akroyd howard cosell billy crystal pointer sisters tony danza sugar ray leonard ella fitzgerald little richard diana ross nelson mandela