Kacey Musgraves packed Nashville’s Bridgestone Arena on Oct. 25 for her Oh, What a World Tour II. The announced ticket sales of 18,373 was a record for a female artist—of any genre.

In addition to performing fan-favorites “Slow Burn,” “Golden Hour,” “Follow Your Arrow” and more, Kacey treated the crowd to a surprise duet with Harry Styles on “Space Cowboy,” before closing the show with “High Horse.”

This isn’t the first time Kacey and Harry have joined forces—Kacey supported Harry on his tour in summer 2018. Kacey co-penned “Space Cowboy” with Luke Laird and Shane McAnally for her No. 1 album, Golden Hour.

Watch Kacey and Harry collaborate on “Space Cowboy.”