It didn't look like Zedd would bring out any special guests after playing several songs, including "I Want You to Know" featuring ex-girlfriend Selena Gomez.

But we were wrong.

In a twist that brought cheers from the crowd, the DJ invited Katy Perry to the stage to sing their collaboration "365."

Perry emerged in a pink pantsuit with silver fringe, paired with silver bangle earrings.

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She asked the crowd to "make some noise" multiple times during the set, and festivalgoers happily obliged.

Even better? Zedd used the song to transition into a remix of "I Want to Dance with Somebody" by Whitney Houston.