Justin Bieber. (inset) Boxer Floyd Mayweather 

Bieber, a onetime teenage heart-throb, has in recent years found himself in trouble for run-ins with authority ranging in seriousness from egg-throwing vandalism to alleged assault on a photographer in Argentina and a limo driver in Canada.

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The 21-year-old Canadian isn’t the only celebrity backing Mayweather over Pacquiao, a winner of world titles in eight different weight categories with a record of 57 victories, five defeats and two draws. Rapper Ludacris told interviewer DJ Envy on the radio show “The Breakfast Club” that Mayweather, is training as never before. “I’ve never in my life seen him this focused and training this hard,” the entertainer said. “He knows that everything is on the line.”