Walked into the studio to a surprise birthday party from these two @jackantonoff & Laura Sisk - 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. 
Taylor Swift took to social media on Wednesday (Dec. 18) to share a glimpse of the surprise birthday celebration thrown for her by frequent collaborator Jack Antonoff.
"Walked into the studio to a surprise birthday party from these two @jackantonoff & Laura Sisk - 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," the superstar tweeted alongside a pair of photos from the recording studio featuring a cake and giant balloons spelling out "Happy Birthday."
On Dec. 13, BIllboard's Woman of the Decade rang in her 30th birthday by performing at iHeartRadio's Jingle Ball in New York -- where 20,000 fans inside Madison Square Garden sang her "Happy Birthday" -- followed by a star-studded Christmas-themed bash attended by the likes of Halsey, Gigi Hadid, Camila Cabello, 5 Seconds of Summer, Queer Eye's Antoni Porowski and Jonathan Van Ness and more.
Check out pics from Swift's belated birthday surprise below.]
