All of this shade goes back to the rumored feud between Taylor Swift and Katy Perry. Swift, 24, spoke to Rolling Stone in September
about the inspiration between her song "Bad Blood" being a pop star nemesis. She said, "She did something so horrible. I was like, 'Oh, we're just straight-up enemies.' And it wasn't even about a guy! It had to do with business. She basically tried to sabotage an entire arena tour. She tried to hire a bunch of people out from under me."