Justin Bieber's manager has taken aim at CSI: Crime Scene Investigation bosses who labelled the Baby singer a brat after he appeared on two episodes of the TV drama, insisting they forgot they were working with a teenager.

The pop star, who played a young thug on the shows, wasn't popular with some of the cast and crew members and really upset one producer by reportedly locking him in a closet.

Bieber's manager Scooter Braun heard nothing but positive reports from his team on the film set and he was stunned when he heard the backlash.

Braun tells Rolling Stone magazine, "The producer gets on (the phone) - he's a stuffy dude, and he's like, 'Justin is incredibly unprofessional. He put his hand in a cake, he locked me in a closet...'

"I said, 'Let me ask you a question. When he locked you in the closet, did you tell him you were angry?' He goes, 'No, I needed him to work, so I laughed.' And I said, 'So he saw you acknowledge his joke and say it's OK? Then you're more to blame than him. He's a kid - he's waiting for someone to tell him where the limits are.'

"At the end of the day, even in his most selfish moments you just need to point out that he's being selfish. He's more embarrassed about it than anything. When he's being a p**ck, he's not being a p**ck because he's famous. He's being a p**ck because he's a kid."

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  • Musicians Usher, left, and Justin Bieber arrive at the 22nd Annual Kids' Choice Awards on Saturday, March 28, 2009, in Los Angeles. (AP Photo/Chris Pizzello)

  • Musicians Usher, left, and Justin Bieber arrive at the 22nd Annual Kids' Choice Awards on Saturday, March 28, 2009, in Los Angeles. (AP Photo/Chris Pizzello)

  • Justin Bieber performs at the Pepsi Superbowl Fan Jam Concert in Miami Beach, Florida.

  • Teen pop sensation Justin Bieber performs with Drake at the Juno Awards Sunday, April 18, 2009

  • Canadian singer Justin Bieber performs live in concert during the NRJ showcase on the 1st floor of the Eilffel Tower in Paris, France

  • Paris Jackson and Justin Bieber during a ceremony honoring the late Michael Jackson with Hand and Footprints in Cement, held at Grauman's Chinese Theatre, on January 26, 2012, in Los Angeles.

  • Canadian singer Justin Bieber performs live during a showcase at the Universale Headquaters in Paris, France.

  • Justin Bieber arrives at the Grammy Awards on Sunday, Jan. 31, 2010, in Los Angeles. (AP Photo/Chris Pizzello)

  • Justin Bieber poses for photographs before a personal appearance at HMV in Westfield, west London. Over 1,500 fans turned up to try and meet the singer.

  • Justin Bieber performs live on stage at the Hard Rock Cafe in Las Vegas.

  • Canadian singer-songwriter Justin Bieber visits LIVE@Much in Toronto on Monday, Oct. 5, 2009. The Canadian Press Images/Christian Lapid

  • Justin Bieber and his girlfriend Selena Gomez

  • Justin Bieber with one of his idols, Sean Kingston

  • Justin Bieber with one of his many lady-friends, Kim Kardashian

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  • L-R: Smokey Robinson, Prince Michael Jackson Jr., Prince Michael Jackson II aka Blanket, Paris Jackson and Justin Bieber during the Michael Jackson Hand and Footprint Ceremony with the children of Michael Jackson making the impressions using shoes and sequined glove once worn by Michael Jackson, held at Grauman's Chinese Theater in Hollywood, California on January 26, 2012.

  • Canadian singer Justin Bieber arrives at the Cannes festival palace, to take part in the NRJ Music awards ceremony, in Cannes, southeastern France, Saturday, Jan. 28, 2012. (AP Photo/Lionel Cironneau)