For her turn, XCX gives Bleachers' "Rollercoaster" the John Hughes school yard treatment and hits the pitch perfectly while singing about a "killer queen."

For more of Charli XCX doing covers, check out her recently launched cover of the track "Money (That's What I Want)" on Vogue. Bleachers is currently on a Christmas tour across the U.S., ending Dec. 20 in Kansas.