Jimmie Allen Returns to the 'Idol' Stage as a Duet Partner. Jimmie Allen Returns to the 'Idol' Stage as a Duet Partner. Allen's not just a successful country star -- he's an 'American Idol' alum.

Kris Allen bests season-long favorite Adam Lambert. May 21, 2009 — -- In what may go down as the biggest upset in the show's history, Kris Allen won "American Idol," beating out Adam Lambert ...