Who is Simon cowell's stand-in on American Idol?

As of my last knowledge update in October 2023, Simon Cowell's stand-in on "American Idol" has been Luke Bryan, who has filled in as a judge during certain seasons. He joined the judging panel alongside Katy Perry and Lionel Richie. Cowell has occasionally taken breaks from the show, allowing Bryan to step in to maintain the show's dynamic.