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"CSI star Marg Helgenberger has criticised Justin Bieber&amp;#039;s behaviour during his two guest stints on the series, describing him as &amp;quot;a brat&amp;quot;. Helgenberger, who plays Catherine Willows on the CBS drama, made the comments during an interview on a French radio station this weekend, when asked how the cast had responded to the Canadian popstar&amp;#039;s involvement. &amp;quot;Justin Bieber wasn&amp;#039;t bad,&amp;quot; the actress said, according to TMZ. &amp;quot;He had never acted before.&amp;quot; However, when pressed, Helgenberger admitted that he had often acted childishly during working hours. &amp;quot;I shouldn&amp;#039;t be saying this, but he was kind of a brat [on the set],&amp;quot; she explained. &amp;quot;He was very nice to me, but he locked one of the producers in a closet, and he put his fist through a cake that was on the actors&amp;#039; table.&amp;quot; Bieber made two guest appearances on CSI as "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.digitalspy.com/showbiz/news/a318407/justin-bieber-was-a-brat-on-csi-set/>