'Idol' Finale Rocks with Michaels, Jackson and Cocker

Forget about who won "American Idol" on Wednesday night -- the finale was all about the surprising performers, including rocker Bret Michaels -- now clearly on the mend -- old standby Joe Cocker, and newly coiffed and still nasty Janet Jackson.

Michaels, who has been making the rounds since winning "Celebrity Apprentice" Sunday, rocked the house with "Idol" finalist Casey James, singing the power ballad "Every Rose Has Its Thorn." Here's the performance:

Then Jackson, sporting a cropped hairdo, came out to do a medley of her songs, including her new tune "Nothing" and classic hit "Nasty." Check it out:

At the ending the show, before the winner was named, British rock singer Joe Cocker joined finalists Crystal Bowersox and Lee DeWyze to perform "With a Little Help from My Friends," a highlight of the evening. Watch!