Swift and Antonoff worked on the majority of her 10th studio album, "Midnights," together. Antonoff helped produce all songs on the standard edition and also helped produce four out of seven deluxe songs. Following the release of the album, Swift wrote a heartfelt post on her Instagram, thanking her collaborators on the record, including a special shoutout to Antonoff. "Midnights is a wild ride of an album and I couldn't be happier that my co pilot on this adventure was @jackantonoff," she captioned the post. "He's my friend for life (presumptuous I know but I stand by it) and we've been making music together for nearly a decade HOWEVER… this is our first album we've done with just the two of us as main collaborators."
Antonoff also commemorated the album release on his Instagram, reflecting on their years-long friendship, writing, "from 1989 to here. so glad we met all those years ago and talked about only you by yaz. the first album we've made entirely together. love you taylor."
The Bleachers frontman even made a fun cameo in the Easter-egg-filled music video for the song "Bejeweled." In the visual, Antonoff appears as Prince Jack, who's ghosted by Swift's version of Cinderella.
