The 18-year-old pop star will help mentor hopeful Lauren Alaina, who sang Cyrus' hit "The Climb" two weeks ago for movie week. Cyrus will appear alongside permanent Idol mentor, and Interscope chairman, Jimmy Iovine.
According to a source, Iovine invited Cyrus to help after Iovine remarked that Alaina was a "much stronger singer" than Cyrus on the show.
Cyrus appeared on Idol last year to help mentor the top 11 finalists during #1 hits week.
Are you excited to see Cyrus on Idol?