Justin Bieber acted like a spoilt brat on CSI

Justin Bieber "was kind of a brat" when he appeared on 'CSI: Crime Scene Investigation'.The 17-year-old superstar made a guest appearance in the drama TV series playing troubled teen Jason McCann, who was shot dead, in the series finale, and according to actress Marg Helgenberger some of his behaviour was unacceptable.Marg - who plays CSI investigator Catherine Willows in the show ' claims