The knockout performance in question happened at the Tight Ends and Friends concert at Music City's Brooklyn Bowl, with Swift getting the crowd hyped up as she took the stage in a black dress and matching heeled boots. As she strummed her guitar, Brown danced along on stage and added extra percussion by shaking a stick of bells.

Swift's surprise performance came after she and Kelce made what fans were calling their "red carpet" debut at the Tight End University’s opening night ceremony on June 23. A video posted by the Tight End University Instagram page showed the couple beaming as they walked a red carpet into the event while hand-in-hand.

During Wednesday’s installment of the “New Heights” podcast, star Chiefs tight end Travis Kelce explained that he and the 14-time Grammy winner pre-planned her on-stage appearance at the Tight Ends & Friends event, where she performed a rendition of her hit song “Shake It Off” with country singer Kane Brown.