Is Justin Bieber an obnoxious brat? That’s what long time cast member,Marg Helgenberger, of CSI seems to think. Helgenberger was of course speaking about Justin Bieber’s recent CSI guest appearances. She claims in an interview with Le Grand Direct des Medias, a French radio show that Bieber’s on set antics included locking a producer in closet and punching a cake that was on the set crew’s snack table. Brat or not, it doesn’t look like Helgenberger or the rest of the CSI crew will have to put up with Bieber any longer as his character on CSI was killed in a police shootout . Maybe they just weren’t ready for Bieber fever?