At the NYC premiere of "Green Zone" on Thursday night, Stern responded to Kara DioGuardi's comments that he doesn't have the musical background to be a judge. Stern fired back at Kara, "I wouldn't work with you. You're horrible!"
Stern says he's got the goods to be a judge and that "Whoever they get is going to be strong and opinionated... I'm not afraid to give people opinions."