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Marg Helgenberger: Justin Bieber Acted Like a 'Brat' on 'CSI' Set

8:18 PM PDT 5/8/2011 by THR staff

The actress claims Bieber, who guest-starred on her show last year, locked a producer in a closet and "put his fist through a cake."

CSI star Marg Helgenberger apparently doesn't have a case of Beiber fever.

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