A string of high profile celebrities sat ringside to watch Floyd Mayweather beat Saul 'Canelo' Alvarez on Saturday night (14.09.13).

Denzel Washington, Jack Nicholson, Liam Hemsworth and Heidi Klum were among the stars that flew to Las Vegas for the boxing match.

Don Cheadle, Sean 'P. Diddy' Combs, Magic Johnson, Kevin Garnett and Lil Wayne also cheered on the 36-year-old American fighter.

The 'Love Me' rapper, 30, joined Canadian singer Justin Bieber to escort the boxer into the ring at the MGM Grand hotel, rapping a live remix of his hit "A Milli."

The 19-year-old 'Beat And A Beat' hitmaker, who was also invited into Mayweather's locker room before the fight, jumped through the ropes to rally support for his friend before the fight began.

Justin flew his huge entourage, including his family and friends Lil Twist and Lil Za, to Las Vegas via a private jet for the event, according to gossip website TMZ.com.

The teen heartthrob shared a picture of himself with the boxer and tweeted after the fight: "@FloydMayweather is the greatest. #MoneyTeam still #undefeated"