Confession, this editor is a Belieber. "Baby, baby, baby, ooh," isn't an uncommon lyric round these parts of the office, so call us sad-faced when we heard that pop-phenom Justin Bieber was a bit on the diva on the set of CSI during his multi-episode guest appearance. Actress Marg Helgenberger, the star of the show, told French radio show Le Grand Direct des Medias Friday, "I probably shouldn't say this, but he was kind of a brat." While she had no issue with him directly, Helgenberger claimed Bieber wasn't as polite was this rest of the crew: "He locked one of the producers in a closet...and he put his fist through a cake that was on the craft services table." Today, Bieber shot back, taking the battle to his millions of followers. "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," the singer Tweeted. While he's only 17, manners are manners. That being said, perhaps Helgenberger is just jealous. (High school) drama!