And the bad blood continues?
To this day, Taylor has never said the song is about Katy, but speculation started when it was confirmed in her Sept. 2014 Rolling Stone interview that the song is about a female artist.
"For years, I was never sure if we were friends or not," Taylor told the magazine at the time. "She would come up to me at awards shows and say something and walk away, and I would think, 'Are we friends, or did she just give me the harshest insult of my life?'"
So is it true?
Watch the E! News video above to get the scoop on Katy's song! And to see what Ruby Rose just said about the track!
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