John Stamos Is Joining 'American Idol' for a Special Reason!

John Stamos is joining American Idol!

The 57-year-old star is set to join the current season as a guest mentor, ET reported Tuesday (April 27).

PHOTOS: Check out the latest pics of John Stamos

If you’ve been following along for the ride, you’ll already know that this season’s Top 9 will be taking a trip to Disney World for a Disney Night episode.

In that episode, they will get some guidance from Big Shot star John Stamos, as well as some inspiration from the Magic Kingdom itself. (John is a huge Disney fan, and even popped the question to Caitlin McHugh at Disneyland in 2017.)

“They said, you know, ‘Could you come down and be a mentor?’ I’m like, ‘Mentor?!’ These kids are so great I’m gonna tell them one thing, and they’re gonna go, ‘Stamos, we’ve heard you sing. Stop,’” he said with a laugh.

“I think John probably said yes when he heard ‘Disney.’ The thing is, John and I are probably the biggest Disney fans. So he gets to go to Disney World with the kids, which is basically the greatest place on Earth, and so I’m a little jealous because they didn’t ask me. I would’ve totally done it!” judge Katy Perry said.

The Top 9 will join the to-be-revealed Comeback show winner to perform a song from the Disney songbook.

One star of the show revealed they had a feeling they would be the next to be eliminated.

American Idol‘s Disney Night airs live on Sunday (May 2) at 8 p.m. ET.