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American Idol producer Nigel Lythgoe is denying rumors that Jennifer Lopez's high demands have cost her a judging gig on the hit Fox show.

"Hello? These people don't know Jennifer Lopez," he tells Extra. "She's a wonderful woman," he said. "I've never seen her be a diva in her life!"

As for Aerosmith frontman Steven Tyler, Lythgoe says: "I don't know. Is that the rumor you've heard? They haven't called me yet. They gotta lay out the bread for me!"

He didn't talk about Internet reports that Shania Twain could be a judge, but he firmly denied that former judge Paula Abdul would return. Says Lythgoe, "Paula is under contract to another company so I don't think that she enters the frame on this occasion."

One thing he can promise: There will only be three judges. "As far as I'm concerned, I would like the attention to go on the kids," he says, "because it's about the talent that comes on this show and sings."