JUSTIN BIEBER WAS A BRAT ON "CSI" SET!

Has fame gone to Justin Bieber's head?

The 17-year-old singer played a troubled teen in a multi-episode guest appearance on "CSI" this past winter and he must have been doing method acting -- because he was "a brat," reveals the CBS show's star Marg Helgenberger.

"I probably shouldn't say this, but he was kind of a brat," the actress said in an interview with French radio show Le Grand Direct des Medias on Friday.

Although Helgenberger said he was nice to her in the one scene they shared, he didn't have the same love for some of the crew.

"He locked one of the producers in a closet," she added. "And he put his fist through a cake that was on the craft services table."

It's unclear if Bieber's bad behavior had any influence on his character's demise: he was shot and killed during a police standoff.

Can you just imagine what kind of little a$$hole he might be with everybody not just kissing his a$$, but licking it! They create little monsters! lol!


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