The two pop queens started off as friends, sharing sweet birthday tweets and cat photos. Things got a little weird when they shared a man — John Mayer — but a case of pilfered backing dancers in 2014 made them, in Taylor’s words, “straight-up enemies.” Taylor threw the first punch by alluding to Perry’s misdeeds in a highly publicized interview. Then she dropped the track “Bad Blood” and its big budget Superhero Mean Girls video. The war of words continued in songs, social media and the press for years until the two hugged it out in Taylor’s 2019 video for “You Need to Calm Down.” A truce was declared but, to quote Katy, is it ever really over?

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