Justin Bieber poses for photos with Mayweather

Justin Bieber is among a host of celebrities including Hollywood A-lister Jack Nicholson attending the Floyd Mayweather fight against Mexico's Saul Alvarez, which could be the biggest grossing bout yet.

Justin Bieber poses for photos with Floyd Mayweather ahead of big fight. Credit: Twitter/ @kidrauhlscrowd

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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.