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Simon Cowell: Ellen DeGeneres 'Nervous' About 'Idol'

Simon Cowell opens up just to "Extra" about the Susan Boyle documentary he's producing.

"It's her story... so you hear it all in her words," Cowell says via Skype. "It's fascinating seeing it through her eyes."

The "American Idol" judge calls Boyle a "great underdog story... it's like a Hollywood movie. You couldn't have written this script better."

Cowell also dishes about Ellen DeGeneres joining "American Idol" this January.

"She's going to be very different than Paula," he says. "I think she's probably quite nervous... She's smart, but make no mistakes: this will be a very different kind of show than what you're used to."

So will DeGeneres sit next to Cowell at the judges' table?

"Obviously, everyone wants to sit next to me," Cowell jokes. "I am thinking about pulling names out of a hat!"

Cowell also shares his thoughts on Oprah Winfrey stepping down from her talk show after 25 years.

"I'm not surprised, to be honest with you," he says, adding that "she will go out on an almighty high."

For more of Cowell's interview with "Extra," tune in tonight!