Demi Lovato sings the National Anthem. AP

The boxing world was held spellbound before and during Saturday’s fight between the undefeated welterweight boxing champion Floyd Mayweather, and mixed martial arts star Conor McGregor.

Celebrities were also not left out of the intriguing bout, yes, it was actually an unusual fight in boxing.

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They were in Las Vegas for the epic money-spinning superfight which saw the American knock out the Irishman in the tenth round.

Demi Lovato sings the US anthem before the fight/Photo: Reuters
McGregor looks relaxed ahead of the bout/Photo: Reuters
Ozzy Osbourne, left, and his wife Sharon await super bout/Photo: AP
Houston Rockets star James Harden was also at the arena. Mark J. Rebilas-USA TODAY Sports
Steve Harvey was not left out of the fun/Photo: Reuters
Music legend P Diddy at the venue/Photo: Reuters
Another basketball star Cleveland Cavaliers’ LeBron James at the venue/Photo: Reuters
Cleveland Cavaliers’ Isaiah Thomas looks forward to the epic fight/photo: REUTERS/Steve Marcus
Former world heavyweight champion Mike Tyson before the fightPhoto: Reuters