Hey, remember that time Katy Perry was a backup singer for a nu-metal band? No? Well, she did, and there's video to prove it.

As most Katy fans know, the singer made a couple genre-specific pit stops en route to becoming the pop star she is today. Her self-titled debut, 2001's Katy Hudson, thematically reflected her intensely-Christian upbringing. She set gospel aside when she signed with Capitol in 2007 and, months after the release of her first hit "I Kissed A Girl," Katy played Warped Tour alongside pop-punk acts and heavy metal dudes. But in the years between 2001 and 2007, her pre-fame musical endeavors included backing vocals on Christian hard rock band P.O.D.'s 2006 single "Goodbye For Now."

While her current stage show is a Lisa Frank sticker come to life, Katy does credit her early rock-influenced beginnings as a boon. "I still have a bit of that California punk-rock attitude always with me," Perry told USA Today. "I'm happy that my first tour was Warped Tour. I really got my bearings there."

You can see Katy belting it out in the video above (video via KLAQ) — and if your appetite for earnest early-aughts rap rock is as thin as mine, go ahead and skip to around the 3:05 mark where she enters the action. You can also watch her perform the song live with the band on The Tonight Show with Jay Leno below.

And, just because it's Throwback Thursday, scroll down even further to watch Katy perform "I Kissed A Girl" on Warped Tour, complete with a stage dive at the end.

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