It sounds like you're referring to a story or headline about a past American Idol winner expressing interest in joining the judges' panel and possibly replacing Katy Perry. Several American Idol winners have gained significant popularity, but stepping into a judging role would require a mix of experience, charisma, and industry insight.
Is there a specific winner or incident you're referring to, or would you like me to elaborate on some American Idol winners who might be well-suited for the judges' panel?