Simon Cowell's Favorite 'Idol' Moment

"American Idol" judge Simon Cowell looks back fondly on all the memories.

"Extra's" Terri Seymour asks Cowell about his favorite "Idol" moment. "Fantasia singing Summertime." And his worst? "I think Clay Aiken singing Grease with red leather jacket. Yes, I think that was a low point."

He has kind words about his former "Idol" colleague, Paula Abdul, who recently signed with CBS for a new dancing competition show "Got to Dance" -- and who will be making an appearance on the "Idol" season finale Wednesday night.

Check out some of Simon's best "Idol" quotes!

"I sent her a note saying I was actually pleased that somebody has built a show around her. It proves her star power and Paula is a survivor. She's much smarter than people know. What I said is, and I literally mean this, I would welcome her on any of my shows. Anytime," said Cowell.

Who is going to be a judge on his new show, "The X Factor"? "It's somebody who I saw a week ago and who I am definitely, definitely going to hire. She is very well known and I think she's going to be incredible." But he won't tell us who that person is. Not yet, anyway.

Tune in to "Extra" on Wednesday for our exclusive interview with Simon!