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Justin Bieber is showing his support for boxer Floyd Mayweather. 

The star made a trip to Las Vegas over the weekend for a special appearance at Mayweather's Saturday night match against Marcos Maidana. 

Justin joined Lil Wayne in escorting the boxer to the ring, walking out to the rapper's new song "Believe Me" featuring Drake. 

Justin, Wayne and Mayweather posed for some pics backstage that were posted by the singer just moments before they made their entrance at the MGM Grand. 

It looks like Justin had the company of Kylie Jenner to enjoy, as well.  The singer posted a photo with the youngest member of the Kardashian clan on Saturday, after both attended the fight. 

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