She paired it with oversize dark denim shorts with orange accents, adding white socks and white, red and black Jordan sneakers.

Eilish wore a black bandana on her dark hair and topped it with a baseball cap as she performed.

The pop star, who recently slammed Rolling Stone, also wore a pair of narrow frameless eyeglasses.

Billie Eilish performed at the Empire Polo Club during Coachella Valley Music and Arts Festival on Saturday

The 22-year-old singer wore a light blue basketball jersey with Los Angeles printed on it. She was seen draping an arm on the actress Ava Capri

The singer-songwriter was surrounded by friends at the star-studded event, and was spotted with her arm around one, the actress Ava Capri.

She was dressed in a green graphic T-shirt with pink pinkstripe shorts and black cowboy Crocs.

The performance comes after Lana welcomed Billie to perform two songs with her during her headlining set on Friday night.

The pair performed Eilish’s 2016 track Ocean Eyes before singing a duet of Del Rey’s 2012 pop ballad Video Games.

‘That’s the voice of our generation, the voice of your generation,’ Del Rey raved about Billie.

@coachella

Are we all best friends @BILLIE EILISH @Do LaB #coachella #billieeilish

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‘I’m so f***ing grateful she’s standing next to me right now, singing my favorite song of hers,’ she added.

Later, the Bad Guy hitmaker also gushed about Del Rey’s impact on her career and the music industry.

‘This is the reason for half of you b****es’ existence… including mine!’ Eilish told the audience.

‘Lana Del Rey, you guys, come on!’ she said, igniting applause from 100,000 attendees.

Eilish made an appearance during Lana Del Rey’s set

Billie delivered a moving performance for festivalgoers

The annual Coachella Music and Arts Festival kicked off on Friday, April 12 and comes to an end on Sunday, April 14. Weekend two will begin on April 19, ending on Sunday, April 21.

The 23rd annual festival is taking place in Indio, California, and fans can catch some of the performances on aYouTube livestream.

In between sets and when music artists are not on the stage, viewers can watch replays of performances, as well as exclusive coverage and behind-the-scenes moments.

In addition to Del Rey, the headliners for this year’s show include Tyler the Creator, Doja Cat and No Doubt.