CSI Star Says Guest-Starring Justin Bieber Was A Brat On Set!

Maybe he was having a bad day???

Justin Bieber played a troubled teenager twice on the police procedural CSI over the past year, and according to series star, Marg Helgenberger, the pint-sized pop star acted a little more than inappropriate during his time on the set!

She explains:

“I probably shouldn’t say this, but he was kind of a brat. He locked one of the producers in a closet. And he put his fist through a cake that was on the craft services table.”

Not very professional, Sir!

Let’s keep the cake-punching and producer-locking to a minimum the next time we film a guest appearance on a television show, shall we?!

LOLz! Seriously, did he really do that stuff?!

[Image via WENN.]