Thousands of fans turned out Wednesday night for the premiere of Justin Bieber's new concert documentary, Believe, in Los Angeles. He brought some of them to tears as he walked the purple carpet at the L.A. Live complex — a little late, naturally, wearing sunglasses and a red suit with a white, untucked shirt.

Believe contains concert footage and also documents some of Justin's well-publicized personal problems. His manager, Scooter Braun, acknowledged to ABC News Radio that the pop star has made some mistakes in the past year. He added, "If you put a camera on me or you at 19, we probably wouldn't be so proud right now. But that's not an excuse." (ALL AUDIO IS ABC 1-ON-1 EXCEPT FOR JON M. CHU)

Director Jon M. Chu said that while Justin can be a troublemaker, "he's like the younger brother who always gets away with it."

Among the stars who made appearances at the premiere: Justin's mentor Usher, Jaden Smith, Kylie Jenner, Law & Order: SVU actor Christopher Meloni and his daughter, and Anchorman 2 star Meagan Good.

Justin Bieber's Believe opens Christmas Day.