"I'm not willing to contribute my life's work to an experiment that I don't feel fairly compensates the writers, producers, artists and creators of this music", she said at the time. The We Belong Together singer sensationally returned to Spotify in the early hours of 9 June - coincidentally, the same day Perry released her new album Witness.
That brings us to Friday, when Perry released her latest album, Witness. Swift's open letter to the company resulted in them reversing the decision within 24 hours. One tweeted: "I aspire to be as petty as taylor swift releasing her discography for streaming the weekend katy perry's album drops".
It's worth noting that Swift's music has been available on Apple Music since 2015, a huge deal for the streaming service which was still in its embryonic form at the time. Swift told Rolling Stone in 2014 that the song was about a feud with another female artist she wouldn't name who "tried to sabotage an entire arena tour". It's been three years since the music has been streamed on most services.
Others are skeptical, though, with one Taylor fan saying: "katy called us "little girls" taylor wanted to thank her "little girls" for having her sell 100M songs by putting her music on spotify".
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The star, who was asked why she finally chose to address their rivalry during her JamesCorden chat, shared: "Well, James Corden makes me and the whole world feel very safe".
Taylor Swift is toasting these days to her significant career milestone with a perfectly timed celebration.
She previously explained the feud on The Late Late Show: "She started it, and it's time for her to finish it. ..."
But for now, all eyes will be on the charts because Katy Perry and Taylor Swift's fans will press play on both of their music.