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 SmithJamie 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!

Check out 10+ pictures of everyone mentioned below and continue reading for the video of Chris performing the Star Spangled Banner…