Charli xcx’s Brat summer is continuing full-steam ahead — and now Billie Eilish is on board.

The two artists released their collaborative remix to Charli’s song “Guess” on Thursday, Aug. 1, as well as an accompanying music video.

In the music video, directed by Aiden Zamiri, Charli, 31, is at a house party with people drinking and dancing as they begin to strip down to their undergarments. Then, Eilish breaks into the house in a bulldozer to sing her portion of the song.

“Don’t have to guess the color of your underwear/Already know what you’ve got goin’ on down there/It’s that lacy black pair with the little bows,” Eilish, 22, sings. “The ones I picked out for you in Tokyo/Saw them when you sat down, they were peekin’ out/I’m gonna tell you right now, they’re all I’m thinkin’ about.”

Then, the duo find themselves outside surrounded by industrial buildings when it begins to rain bras and underwear. (Per a press release, all bras and underwear used in the music video have been donated to I Support the Girls.)

Billie Eilish in Charli xcx’s “Guess” remix music video.YOUTUBE

Eilish also sings her own clever — and flirtatious — version of the chorus.

“I wanna try it, bite it, lick it, spit it/Pull it to the side and get all up in it/Kiss it, bite it, can I fit it?/Charli likes boys, but she knows I’d hit it/Charli, call me if you’re with it,” Eilish, who’s been open about her bisexuality, sings.

Charli xcx and Billie Eilish.COURTESY ATLANTIC RECORDS

Charli first released “Guess” as a part of Brat and it’s the same but there’s three more songs so it’s not on June 10, alongside “Hello goodbye” and “Spring breakers,” which both also appeared for the first time on the deluxe project.

Charli teased something new with “Guess” on Wednesday, July 31, posting a risqué image to Instagram alongside the caption “Guess?” Fans on Instagram also noticed flyers posted with the same image and the word “GUESS” encouraging fans to call a phone number that played a brief snippet of the track.

Billie Eilish and Charli xcx.COURTESY ATLANTIC RECORD

The following day, on Aug. 1, she and Eilish both shared clips from the track’s forthcoming music video on Instagram, which led off with Charli saying “Hey, Billie, you there?” before stepping into an empty apartment flanked only by a folding chair. The video then cuts to a black and white image teasing the song’s release time followed by another brief clip of her and Eilish falling into a pile of women’s lingerie.

Upon its initial release, BRAT topped out at No. 3 on the Billboard 200, a career-best for Charli. The album has since become an unofficial anthem of the summer, with everyone from Katy Perry to Vice President Kamala Harris taking part in Brat-related social media trends.