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Time to throw party in the USA!

FOX confirms that Disney sweet-tart Miley Cyrus will be the celebrity mentor on this week's episode of American Idol. There are eleven contestants left and they will be performing Billboard No. 1 hits on Tuesday's show.

Then on Wednesday's results show, Miley returns to sing "When I Look At You" - plus, Joe Jonas and Demi Lovato will perform their duet, "Make A Wave."

Think it'll be awk for the contestants to get music advice from Hannah Montana, who's younger than mostly all of them? Welcome to Hollywood!