Inside the Idol Finale!

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Dane Cook

Dane Cook performed a song about the former Idol wannabes whom Simon Cowell has poked fun of.

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Crystal Bowersox and Alanis Morissette

The runner-up sang "Ironic" with Morissette.

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Kris Allen

The season 8 winner sang "The Truth."

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Lee DeWyze and Chicago

The winner and Chicago performed a medley together.

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Gen. Larry Platt and William Hung

General Larry Platt sang his audition hit "Pants on the Ground" -- and was joined by William Hung! (Hung memorably butchered Ricky Martin's "She Bangs" in his 2003 try out.)

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Christina Aguilera

Lacey Brown, Didi Benami, Katie Stevens, Siobhan Magnus, Crystal Bowersox and Paige Miles sang "Beautiful" and then "Fighter" with Aguilera.

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Janet Jackson

The Top 12 sang "Again" with Jackson, who then performed a medley of her hits solo.

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Bret Michaels and Casey James

Third-place runner up James sang "Every Rose Has Its Thorn" with Bret Michaels, who returned to the stage for the first time since suffering a brain hemorrhage and stroke.

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Simon Cowell and Paula Abdul

The former judges reunited after Abdul introduced a retrospective video about her first meeting with Cowell. "After sitting in between two men whose boobs were bigger than me, I had to go," she joked.

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Michael Lynche and Michael McDonald

Michael Lynche sang "Takin' It To The Streets" with Michael McDonald.

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Carrie Underwood

The season-4 winner performed "Undo it."

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Hall & Oates

Lee DeWyze, Andrew Garcia, Michael Lynche, Casey James, Aaron Kelly and Tim Urban sang "I Can't Go For That" and "You Make My Dreams Come True" with Hall & Oates.

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Siobhan Magnus, Aaron Kelly and the Bee Gees

Magnus and Kelly performed "How Deep Is Your Love" with the Bee Gees.

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Bowersox, DeWyze and Ryan Seacrest

Tension! Seacrest announced that Lee DeWyze is the winner.

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DeWyze

The newly-crowned American Idol sang U2's "Beautiful Day."