Floyd Mayweather sure knows how to make an entrance. Justin Bieber shocked boxing fans and his own Beliebers alike when he appeared in the entourage of boxer Floyd Mayweather last night. Mayweather beat Miguel Cotto at the highly anticipated match in Las Vegas last night, proving once again that he is the undefeated champion. He defeated Cotto in a 12-round unanimous decision.

The Never Say Never singer held up one of Mayweather's belts while entering the ring, along with rapper 50 cent.

Many sports stars reacted to Justin's random appearance at the match, with Golden State Warriors power forward David Lee tweeting: "I'm going to need a reason that Justin Bieber just walked out of the locker room with Floyd and 50 cent," Lee tweeted.

Khloe Kardashian's husband Lamar Odom tweeted: "I heard an announcer say Justin Bieber looked out of place with 50 and Floyd. Didn't appear that way to me. It's entertainment baby!"

After the game Floyd tweeted: "Everyone who bought PPV, who came out to Vegas and #TheMoneyTeam -- Thank you."

Bieber tweeted to Floyd: "@FloydMayweather Hard Work & Dedication . congrats champ. glad i could be a part of it"

TMZ reported that Justin's appearance with the boxing champion for his fight against Cotto was months in the making. TMZ was told that the unlikely pair became friends after Floyd saw Justin's movie, "Never Sa Never." TMZ sources say Floyd wanted to mentor Justin and that the two hit it off.

Bieber spoke about his admiration for Floyd in an interview with V Magazine in January. He told the magazine: "Everyone wants you to be on top, and as soon as you're there -- like Floyd Mayweather, he's the best boxer in the world. Now he is a champion. Every time he goes to a fight now, people are like, 'He's going to lose this time,' and then he wins. And the next time they say, 'He's going to lose,' again ...Every time he wins. And people aren't ever going to know that he's a champ."

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