On Tuesday, September 18, Swift's longtime friend and producer, Jack Antonoff posted an Instagram tribute to Electric Lady ...

Jack Antonoff has Swifties spiraling after sharing a previously unseen photo of Taylor Swift in the studio last year.

"Swifties everywhere are sharing their theories after Taylor Swift's close friend and frequent collaborator, Jack Antonoff, ...

LOS ANGELES, CALIFORNIA: Fans are buzzing with theories after Taylor Swift's close friend and collaborator, Jack Antonoff, ...