Marg Helgenberger: Justin Bieber a "brat" on "CSI" set

(CBS) Not everyone has a case of "Bieber fever." "CSI" co-star Marg Helgenberger called the teen popstar a "brat" after the two worked together last year.

Bieber made his acting debut last year on two episodes of the CBS drama series.

Pictures: Magnificent Marg Helgenberger
Pictures: Justin Bieber

In an interview with French Magazine Le Grand Direct des Medias, Helgenberger admitted, "I shouldn't be saying this but he was kind of a brat [on the set]."

"He was very nice to me," she continued, "but he locked one of the producers in a closet."

Bieber also "put his fist through a cake that was on the craft service table."

Despite his off-screen antics, the Hollywood Reporter notes,  Helgenberger admired  Bieber's acting skills.

"He's actually better than you'd think," she said.

This isn't Bieber's only acting experience on-screen. The popstar starred in the hit concert documentary "Never Say Never." According to the Huffington Post, Bieber is reportedly in talks with "The Fighter's" Mark Wahlberg about an upcoming film.