Ariana Grande reunited with *NSYNC during her set at Coachella

Last year we had #Beychella. This year, it's #Arichella.

Ariana Grande wowed festival goers -- and livestream viewers -- with her closing set at Coachella week one. Sunday night, after some major teasing on Twitter, the pop star finally revealed one of her special musical guests: *NSYNC.

The popular boy band of the late 90s and early aughts joined Grande to sing their hit "Tearin' Up My Heart."

"I've been rehearsing my whole motherfucking life for this moment," Ariana says before they all start singing the iconic bop in unison.

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Notably, the band's former frontman Justin Timberlake couldn't make it, as he is finishing his own tour. But that didn't stop the rest of the band from living their best life and giving it their all with Miss Grande, who sang Timberlake's parts in his absence.

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The band also performed a remixed version of Grande's "Break Up With Your Girlfriend, I'm Bored," the hit they're actually credited on. The song samples a riff and some lines from *NSYNC's 2000 deep cut, "It Makes Me Ill."

Grande's set featured a couple other surprises, too. She brought out Nicki Minaj to sing their popular jam "Side to Side," as well as Mase and Sean "Diddy" Combs to sing "Mo Money Mo Problems," in tribute to The Notorious B.I.G..

Her set list features 23 songs as well as multiple interludes.

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The Sunday night performance was the first of two to be put on by the "Thank U, Next" singer. Grande will take the stage again on Sunday, April 21st, acting as one of the festivals closers.

You can watch the YouTube livestream of the three-day festival, including Grande's performance, here.