Miley Cyrus to Mentor American Idol Contestants

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Miley Cyrus will mentor the remaining 11 American Idol contestants this week.

The 17-year-old will appear on the show this Tuesday to help the wannabes prep for their performances on a Billboard No. 1 hits-themed show.

Meet Idol's top 12!

Past mentors have included Paul McCartney, Slash, Mariah Carey and Dolly Parton.

On Wednesday’s show, Cyrus will perform her tune "When I Look At You."

She isn't the only Disney star making a cameo that night.

Joe Jonas
and Demi Lovato -- who recently confirmed they're dating -- will sing their duet, "Make a Wave" before an Idol is sent home.

See what a body language expert had to say about these teen couples

Jonas appeared as guest judge during Dallas auditions earlier this season.