Marg Helgenberger Says Justin Bieber Was A Brat On ‘CSI’ Set

Teen pop star Justin Bieber has been called a “brat” after his backstage behavior while filming CSI.

During a French radio interview, actress Marg Helgenberger (seen here in Paris on May 7, 2011) opened up about the mischievous things the 17 year-old got up to when he was a guest star on the crime drama series. The actress said: “I shouldn’t be saying this, but he was kind of a brat.”

VIDEO: Justin Bieber Gets Egged On Stage

She added: “He was very nice to me. But he locked one of the producers in a closet.” Bieber also allegedly put his fist through a cake that was on the cast’s table.

But Helgenberger did praise the singer’s talent. She added: “He’d never acted before. He is better than you’d think.” Canadian Bieber, 17, appeared in two episodes of the crime drama as a troubled teen, before his character was gunned down after firing at police.

Listen to Marg Helgenber talk about Justin…