Katy Perry just made a stunning announcement ... she's dunzo with "American Idol."

The iconic singer appeared on Monday night's "Jimmy Kimmel Live!" dropping the bombshell after 7 years as an 'Idol' judge alongside Lionel Richie and Luke Bryan.

Jimmy kicked things off, asking Katy point blank if she was going to continue with the show.

At first, Katy didn't answer the question directly, responding that she was looking forward to performing in Brazil's Rock in Rio music festival this fall.

Then she delivered the 'Idol' shocker ...  "I think this will be my last show, my last season for 'Idol.' I love 'Idol' so much, it’s connected me with the heart of America. But I feel like I need to go out to feel that pulse of my own beat."

Many in the audience sounded bummed by the news, but Katy handled it like a seasoned pro with her smiles and upbeat demeanor, turning the mood back to a positive vibe.

Yet, Jimmy seemed a bit startled, pressing Katy on what her fellow judges -- Lionel and Luke -- thought about her exit.

Katy replied, "Well, they'll find out about it tonight," indicating the two were only aware she had some new projects in the works.

Her last season is scheduled to start on February 18 as the singing competition TV series hits the 22-year mark.