Lots of celebs headed to Las Vegas Saturday evening (May 1) to catch the Floyd Mayweather Jr. vs “Sugar” Shane Mosley welterweight fight at the MGM Grand Garden Arena.

Some of the famous faces spotted in the crowd included Diddy, Mariah Carey and Nick Cannon, Will Smith, Jamie Foxx, Earvin “Magic” Johnson and singer Chris Brown, who performed the National Anthem before the opening bell. Even boxing legend Muhammad Ali was spotted ringside at the big fight!