Taylor Swift and Katy Perry's feud continues

It's no secret that pop icons Taylor Swift and Katy Perry don't get along.  It seems the feud is only getting worse.

It all began in 2013, when dancers on Swift's Red tour departed to join Perry on her Prismatic tour. Swift felt undermined, and was openly upset when the dancers were hired out from under her.

Four years later, nothing has changed. On Carpool Karaoke with James Corden, Perry spoke about the rift: "She started it, and it's time for her to finish it." Perry went on to  say she would accept an apology from the singer: "Women together will heal the world."

That said, Perry  made it clear she is still angry with Swift: "There's a law of cause and effect: you do something, there's going to be a reaction," she says to Corden. "Trust me daddy: there's gonna be a reaction."

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