The two-day finale of the rebooted American Idol airs Sunday and Monday on ABC.
On Sunday the Top 3 finalists -- Caleb Lee Hutchinson, Gabby Barrett and Maddie Poppe -- will sing. But they're not the only ones who'll take the mic. The three judges -- Katy Perry, Lionel Richie and Luke Bryan -- will also perform -- along with Bebe Rexha, Nick Jonas and Mustard, PattiLabelle, Darius Rucker, Gary Clark Junior and Yolanda Adams. Kermit the Frog will make an appearance.
The Top 10 finalists will take the stage as well.
Radio personality Bobby Bones will return as a mentor on Sunday, which will include hometown visits for Hutchinson, Barrett and Poppe.
On Monday night the winner will be revealed.