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Kara DioGuardi was on Ryan Seacrest's KIIS FM show this morning to say that she's still stunned Paula quit the show in an apparent salary dispute.

"I can't get over it. I'm completely shocked," she told Ryan. "It's such a loss for the show, such a loss for the contestants. She's definitely the heart of the panel. The kind of heart she treated the contestants with she treated me with last year," DioGuardi went on to say. "She was so kind to me and made me feel immediately like part of the panel."

But Paula had no problem speaking out about the fact that she felt Idol didn't need a fourth judge, even though she and DioGuardi were old friends.

Kara says she hasn't talked to Paula since the announcement was made, but "I've left her a lot of messages."

Victoria Beckham (whose currently at the Denver auditions) and Katy Perry have already been tapped for guest judging spots on the show, but Fox is already searching for someone to permanently replace Paula.

Who do YOU think should be added to the panel?