Justin Bieber Squares Off Against Security Guard

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Perhaps Justin Bieber really is a changed man.

We've documented many times in the past how the singer took issue with various photographers and members of the paparazzi who dared to stand in his way.

Remember that instance where he totally went off on a reporter in London?

But Bieber kept his calm and kept his cool during a confrontation last Saturday night in Las Vegas, after a security guard would not let Justin into the boxing ring to celebrate with Floyd Mayweather.

Nevermind the fact that Bieber had actually just been in the ring and is a member of Mayweather's entourage.

At one point, as seen here, the security guard actually threatens Bieber with handcuffs. But, again, to Justin's credit, he stays collected.

As for the next step in Bieber's evolution? He has to stop hanging out with a woman beater such as Floyd Mayweather.

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