Indio, California – Headliner Lana Del Rey took to the Coachella stage for a harrowing set in the California desert on Friday night, and brought on a surprise guest: Billie Eilish.

Coachella, arguably the world's most famous music festival, kicked off Friday with its signature fest fashion galore and was capped off by none other than Sad Girl Music's mother, Lana Del Rey.

Despite the buzz, Lana did not bring on Taylor Swift, who is said to be having a weekend enjoying the fest. (As Swifties will remember, Tay dragged the Summertime Sadness singer onstage with her in February while accepting her Grammy for Album of the Year.)

But Lana did bring out another pop superstar, whom she called "the voice of our generation": Billie.

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The 22-year-old has long been a fan and sung the praises of Lana, her lengthy career, and her influence, and there's been plenty of talk about a collab between the two. And on Friday night, they took things to another level.

The two dueted Billie's song Ocean Eyes and Lana's Video Games. They sat afterward soaking it all in, when Eilish broke the moment's magic and joked, "Get the f**k out of my face."

"Yep, that's the voice of your generation, the voice of our generation," Del Rey replied, speaking to the crowd. "I'm so f**ing grateful she's standing next to me right now."

"This is the reason for half you bitches' existence, including mine," Billie told festivalgoers of Lana in response.

Lana Del Rey also brought out guests Jon Batiste and Jack Antonoff. She last appeared at Coachella ten years ago with her signature haunting alt-pop sound.

This time around, she wore a sparkly mini dress and blinged out knee-high boots, flanked by dancers. She closed the headlining set with her epic ballad Young and Beautiful, complete with fireworks as she drove off on a motorcade.

Coachella also saw Shakira drop by as a superstar surprise on Friday night for a cameo during Argentinian superstar Bizarrap's set. Saturday and Sunday will have headliners Tyler, the Creator and Doja Cat round out the rest of the weekend 1.