Taylor Swift is hot on the promotion trail for her sixth studio album, Reputation. On Friday, the 27-year-old singer treated fans to a surprise performance of her song "Call It What You Want" during an intimate SiriusXM session. "Do you feel like hearing a new version?" she asked her adoring fans before delivering a stripped-down rendition of the song, which is rumored to be about her boyfriend, Joe Alwyn. Listen to Taylor's stunning acoustic adaptation below.