aylor Swift paid tribute to her friend and long-time collaborator, Jack Antonoff, on the occasion of the release of her much-anticipated rerecorded album, 1989 (Taylor’s Version).

On Sunday, the Grammy-winning musician took to Instagram to express her gratitude to Antonoff, whom she credits with sparking a pop touch in her music.

Swift and Antonoff originally met at the MTV Europe Music Awards in November 2012, and their first official collaboration was released the following October. They released Swift’s One Chance soundtrack single Sweeter Than Fiction.

Swift penned, “There you’ll stand ten feet tall, I will say ‘I knew it all along’ This song has always made me think of my friend Jack.”

“It was the first song we made together and watching him challenge himself and make beautiful art over the years has been the thrill of a lifetime. How can he be 6 years older than me and also somehow still be my precocious young son? We may never know,” she concluded.

The musician continued by informing fans that “Sweeter Than Fiction (My Version)” is now only available on Tangerine vinyl.

In an interview with Today, Antonoff discussed his experience working with Swift. “I could quantify our relationship in very reductive ways about the things we agree on, the sounds we like,” he went on to say. “But the truth is, we’ve just grown together. She put an amazing amount of belief in me. And it’s powerful.”