Katy Perry Joins Zedd Onstage at Coachella to Perform '365'

Katy Perry just made a surprise appearance onstage at Coachella!

During day three of the music festival in Indio, California, on Sunday, the 34-year-old singer crashed Zedd's set to perform their catchy new hit single, "365."

Perry brought her A-game, not only slaying her vocals and performance, but serving the audience with yet another fierce look. The American Idol judge wore a custom red Area jumpsuit paired with a rhinestoned overlay.

"Feel like I’ve been doing full looks at @Coachella for as long as some of these people have been alive," she tweeted prior to the show, making a joke about the young crowd.

Just a few hours before Zedd's set kicked off, Perry teased the appearance via Twitter, telling her fans to tune into both American Idol and the Coachella live stream.

"After you're done watching Idol, East Coast (and before yours begins, West Coast), you might want to check out the Coachella live stream... around 7:30pm poss?" she wrote, using the hashtag #GetYouAGirlWhoCanDoBoth.

Fans began speculating earlier this week that Perry would be teaming up with Zedd at Coachella after she revealed her location via Instagram.

Then, the singer and her fiancé, Orlando Bloom, were spotted holding hands and packing on the PDA inside the festival grounds on Friday, adding even more fuel to the fire.

For more celeb sightings at Coachella, click through the slideshow below!

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