Perry announced that Aerosmith will appear on the season-ender while telling Rolling Stone that he no longer opposes bandmate Steven Tyler's judging role on Idol.
"[My anger] wasn't about the show - it was about how we found out about it [on the internet]," Perry explained. "I was p*ssed off about that whole thing, but I've played on it before and the band is gonna play on it in the last episode of the season to debut the new single.
"So it's not about the show, it's about how we found out about it. It was a bit of a shock and it took us off balance."
American Idol producers have not yet confirmed Aerosmith's performance on May 23.
Perry also spoke about the pressure of releasing Aerosmith's first new studio album in eight years this summer.
"I've been wanting this record to come out for years, but there's a reason for everything and the timing for this is just right. The pressure for this to be what everyone hopes it's going to be is enormous and I'm starting to feel a little bit of that heat," the guitarist admitted. "We've talked about doing a new record and it's kind of like the boy crying wolf the last bunch of years.
Perry continued: "I just have to wipe out all the expectations that everybody has because we've always done every record on its own, taking its own place, not looking at it in the context of the last record or the next record or whatever is going on in the world or whatever.
"It's just about getting in and trying to do what we do best and that's it. I'm definitely feeling some of that weight. It's really about keeping the doors locked and finishing this up without letting any of that get to us."
Tyler also previewed Aerosmith's upcoming LP this week by saying that it features some of the band's best work in years.
Watch Aerosmith's 'The Other Side' music video: