“Bieber Acted Like Brat On CSI Set” Says Co-Star

He may be the adored by 10 year-old girls the world over, but apparently Justin Bieber isn’t the darling that he seems.

Marg Helgenberger, who plays Catherine Willows on the crime drama CSI, branded Bieber a ‘brat’ and claimed he often acted unprofessionally during his guest stint on the show.

Helgenberger made the comments during an interview on a French radio station after being asked how the cast had responded when the Canadian popstar joined the cast as a guest star.

According to TMZ, the actress said: “Justin Bieber wasn’t bad. He had never acted before.”

However, when pressed, Helgenberger admitted that he had often acted childishly during working hours.

She added: “I shouldn’t be saying this, but he was kind of a brat [on the set]. He was very nice to me, but he locked one of the producers in a closet, and he put his fist through a cake that was on the actors’ table.”

Bieber made two guest appearances on CSI as teenage bomb expert Jason McCann, before his character was dramatically killed off in February.