Billie Eilish brought out Charli XCX for a ‘Guess’ remix at the LA show

Billie Eilish celebrated her 23rd birthday a day early on Tuesday (December 17) at the Kia Forum in Los Angeles when she invited Charli XCX to the stage for a surprise collaboration on her “Guess” remix.

The singers teamed up to perform the Grammy-nominated, high-energy song from Charli’s remix album. Brat and It’s the same but There’s Three More Songs Also It’s not for the first time live at last night’s show. And in one bratOn an appropriate note, the Forum was bathed in the album’s signature lime green color palette as acidic apple-colored lights illuminated the stage and green lasers flashed throughout.

The audience screamed along to every word as Billie sang, “Don’t have to guess what color your underwear is/You know what you’re doing down there/It’s that black lace pair with the little bows/The ones I have.” picked out for you in Tokyo,” as Charli danced and moved her arms to the song’s sapphic storyline.

Then the two women went wild as the track’s thumping beat picked up steam, bouncing around the stage and getting the audience even more pumped up. It was wild and Charli clearly had a lot of fun, as evidenced by a video she posted with the caption, “I love you billieeeeee and hd!!!” <3"; Eilish turns 23 on Wednesday (December 18).

Eilish’s Hit me hard and soft The album is nominated for seven Grammys next year, including Album of the Year and Best Pop Vocal Album. Charli is also up for seven awards, including Record of the Year (“360”), Album of the Year and Best Performance by a Pop Duo/Group for “Guess.”

Eilish has two more sold-out nights at the Kia Forum on Friday (December 20) and Saturday (December 21) before heading to Australia in February and early March, followed by spring/summer 2025 dates across Europe.

Check out footage from the surprise collaboration below.