Helgenberger went on to explain that she reached her conclusion after guest star Bieber locked a producer in a closet and put his hand through a cake (what pop star hasn't done that?).
A wounded Bieber took to his Twitter Monday, writing, "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.
He continued, "I know who i am and sometimes people r just going 2 say what they want. Keep ur head up and be the man ur mama raised ... Rumors are just that...rumors. In the end if you just be kind and be yourself people will know who you are. That goes for anyone i think."
But don't worry about Bieber. It's safe to say his legions of rabid fans are already scribbling away at some CSI hate mail.