In a recent interview with the French radio show "Le Grand Direct des Médias," Helgenberger said teen sensation Justin Bieber was a bit of a pain to work with during his two-episode arc on the CBS procedural. "I shouldn't be saying this, but he was kind of a brat," she said. "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' table."
Bieber debuted on CSI's Season 11 premiere as Jason McCann, a troubled teen who had a fondness for blowing things up. He reprised the role during February sweeps, when (spoiler alert!) his character was shot and killed after he planted a bomb at the home of team member Nick Stokes (George Eads).
Bieber responded to Helgenberger's comments on Twitter Monday. "I know who i am and sometimes people r just going 2 say what they want," he wrote. "Keep ur head up and be the man ur mama raised. #killemwithkindness."
Watch video of Helgenberger's interview below.