Justin Bieber celebrates with Floyd Mayweather

Justin Bieber joined Floyd Mayweather ringside after last night's world title fight. Credit: Reuters

Justin Bieber was among a cast of A-list celebrities attending Floyd Mayweather's world title fight against Saul Alvarez in Las Vegas, and the pop star joined the American boxing champion after his win.

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Mayweather wins 'richest' fight

American Floyd Mayweather defeated Mexico's Saul Alvarez on a majority decision in what could be the highest grossing fight yet in Las Vegas.