Taylor Swift and Katy Perry were friends back in the early 2000s and often out together before the biggest drama of the decade pitted the country and pop singers against each other. The two were allegedly caught in a love triangle with John Mayer, which ignited it all. But "Bad Blood" was the final straw when Swift let her true anger out. Many speculated the 2015 song was about Perry, including Perry. In an interview with Rolling Stone, she said:
"For years, I was never sure if we were friends or not. 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?"
She claims Perry did something unforgivable, which solidified that they were enemies, and it wasn't even about a guy.
As of now, the two have squashed beef in 2018 when Perry gifted Swift an actual olive branch during her Reputation Tour. Then Taylor Swift sent Perry "Peace at Last" cookies.