Thanks to one lucky fan, who happened to be driving through Los Angeles at the same time as Perry and Corden on Monday, we know they're going to belting out a rendition of Perry's hit "Dark Horse."
"Only in LA #katyperry #carpoolkaraoke," Instagram user nycdarren captioned a video he posted showing the singer -- rocking a super short blonde 'do and a blue, button-down collared shirt -- crooning her single out the window of Corden's SUV.
"It's going to be great. I'm so excited. We haven't shot it yet, we're shooting it next week. I know it's gonna be amazing," Corden shared. "I'm so looking forward to just being in her orbit for just a little bit of time. You know, I'm a huge fan."
Check out the video below to hear more from Corden on which of her songs, apart from "Dark Horse," fans might get to see Perry perform while rocking out in Corden's car.
The Late Late Show Carpool Karaoke Primetime Special 2017 airs May 22 at 10 p.m. ET/PT on CBS.