Paula Abdul says her contract is up this season on American Idol, and that no one can ever replace her. In an interview on ABC News's Nightline, which aired on Thursday, Abdul said she loves the show, especially this season, which has a fourth judge, Kara DioGuardi. "I love the show, I do. I love what I do on the show… It's taken me a while to get comfortable in my own skin," the TV judge said. Asked by Nightline's Cynthia McFadden if she thinks DioGuardi will replace her on the show, Abdul said, "I don't think anyone (can). First of all, Kara says, 'I could never replace you'. "And I said whenever there is change it's not about replacing anybody - it's about possibly moving on." Abdul said she had no problem that DioGuardi joined the judges panel, along with herself, Simon Cowell and Randy Jackson, but she wasn't consulted about the decision beforehand. She said she was told DioGuardi would be part of the show while heading to the airport in August 2008 to judge Idol tryouts. "I thought that all of us as a group, maybe we could even figure this out together and I was surprised, because Simon has always been against the fourth (judge). "We have had guest judges on before and he banned that from happening anymore," Abdul said. Source:Tonight