Kara DioGuardi and Paula AbdulKara DioGuardi is still "completely shocked" about Paula Abdul quitting 'American Idol.' She's been trying to reach the 'Straight Up' singer all week hoping to persuade Abdul to "reconsider" her decision to leave

"It's such a loss for the show, such a loss for the contestants. She's definitely the heart of the panel," DioGuardio said Friday on Ryan Seacrest's radio show.

DioGuardi admits she was terrified joining the judges panel last year, but it was Abdul who eased her fears.