Billie Eilish is having a Brat summer.

The nine-time Grammy winner hopped on a remix of Charli XCX’s Brat bonus track “Guess,” as well as the music video for the NSFW track.

In the visuals, released on Aug. 1, colorful underwear fly across the screen as Charli lets loose amongst a group of scantily clad dancers. As she sings about her own pair of briefs, the 31-year-old references Billie’s 2024 track “Lunch,” an equally steamy song suspected to be about oral sex.

“Eat it up for lunch,” Charli sings, before the 22-year-old busts through the wall driving a tractor. “Yeah, it’s so delicious.”

Charli and Billie then strut down a street filled with lingerie while singing—you guessed it—about their own underwear. “I saw them when you sat down, they were peaking out. I’m gonna tell you right now they’re all I”m thinking about,” Billie drawls before glancing over at the “360” singer. “Charli likes boys but she knows I’d hit it.”