Judges Katy Perry, Lionel Richie and Luke Bryan will also perform on the three-hour season capper.
Five became three as America cast its votes.
He will also take the stage to perform during the May 21 finale.
The contestant's stunning performance propelled him into the top five of the competition.
The new English monarchs did some bits on Sunday night's show.
The top 8 was whittled down to 5.
It's different for awards shows, daytime TV and reality singing competitions.
Next week's panel will be shaken up while two of the judges fly to England for King Charles III's coronation.
The high-schooler took it home with a cover of Louis Armstrong’s “What a Wonderful World.”
The Queen frontman and solo star blew away the judges on Sunday night.
