George Michael is set to surprise American Idol fans watching the show's finale on Wednesday night - he'll reportedly perform live.

The British pop superstar is rumored to be the big draw for the two-hour finale, when either David Cook or David Archuleta will be crowned the 2008 Idol.

Earlier this week, Idol producer Nigel Lythgoe revealed the "biggest star in the world" was coming to close out the current series of the talent show.

The finale will also feature a performance by Carrie Underwood, who was recently voted the best Idol winner ever.

- George Michael Gallery
- American Idol Pictures

(This news article provided by World Entertainment News Network)