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Justin Bieber's Biggest Celeb Beefs

Marg Helgenberger

CSI star Marg Helgenberger wasn't impressed when Bieber guest starred on the hit CBS show, calling him a "brat" in an interview with French radio show Le Grand Direct des Medias in May 2011. "He locked one of the producers in the closet," she recalled, "and he put his fist through a cake that was on the craft services table."

Bieber's response via Twitter?

"It's kinda lame when someone you met briefly and never worked with comments on you. I will continue to wish them luck and be kind."

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