Swift closed 2019 with a bang as she performed at the Jingle Ball concert the night before her 30th birthday, which she rang in with her close friends, including Blake Lively, Ryan Reynolds, Gigi Hadid, and Antonoff, of course. A few days later, Antonoff, along with the recording engineer Laura Sisk, threw a surprise birthday party for Swift at their recording studio. The "Lover" singer shared sweet snaps from the intimate party on her Instagram, captioning the post: "Walked into the studio to a surprise birthday party from these two @jackantonoff & @sharp_stick - it's equally wild and cozy to think it was the three of us in a room making a song called Lover here last year. ♥️"
