JUSTIN BIEBER's manager SCOOTER BRAUN raised thousands of dollars for charity by dressing in his pajamas to serve drinks to guests at the Sundance Film Festival on Sunday (20Jan13).

Bieber's friend and business associate donned a 'onesie' while he was tending the bar during a party at the Rock and Reilly's venue in Park City, Utah, and he donated all his tips to the Pencils of Promise charity.

He raised $21,000 at the event, which featured a football game screening and a DJ set from rapper Asher Roth.

Braun writes in a post on Twitter.com, "Thank u (sic) to Rock and Reilly Sundance... We had a blast and in bartending we raised an amazing $21k for Pencils Of Promise!!! Amazing."