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When pop radio stars collide.

For BBC Radio 1’s Live Lounge, the women of Fifth Harmony covered Elle King’s hit rocker “Ex’s and Oh’s.”

“We wrote it as kind of a joke,” King told EW earlier last year of the hit song. “[Dave Bassett, King’s songwriting partner] was like, ‘Hey, Elle, who you been dating?’ And I was like, ‘Well, this guy’s mad at me, and I was really mean to this guy, and this guy’s a loser but he still calls me.’ And we just started laughing and writing this song.”

For the cover, Fifth Harmony turned the rockabilly track jazzy, fully embracing the lounge part of Live Lounge. Listen below.