Keith Urban will emerge from behind the judges' table to perform a song on Thursday night's American Idol results show.
Urban let the cat out of the bag on Twitter Wednesday night, tweeting, "Psyched to play tomorrow night on #Idol.... I hope Randy and the girls put me through !!! -KU #IdolKU."
The Idol judge is heading out on the road this summer for his "Light The Fuse" tour. Tickets go on sale April 5.
Urban's performance is one of several celebrity performances for Thursday night's 450th episode. Already announced for tomorrow night: season 11 finalist Colton Dixon, and season five runner-up Katharine McPhee, who will join OneRepublic for a duet of the group's new single, "If I Lose Myself," from their CD, Native Son released this week.