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It’s unclear exactly when Taylor Swift and Katy Perry’s long-running feud began. They used to pose together at awards shows, and then they stopped.

Rumour has it Katy pinched some back-up dancers from Taylor, and then it all gets a bit murky until Swift rounded up one hell of a squad for her Bad Blood video, which is widely believed to be about Perry.

The latest acknowledgement of their mutual dislike was when Calvin Harris dragged Katy into his recent beef with now ex Taylor and she gave a subtle but clear response via a meme on Twitter – until today. Again on Twitter, Katy has been candid about her enemy, saying that Swift has some apologising to do.

When a fan asked Katy if she would ever collaborate with Taylor, she replied “If she says, sorry, sure!”

The Rise singer didn’t elaborate on exactly what it is Taylor needs to make amends for. But the response indicates that Katy feels wronged by Swift, and that if she got an apology, there’d be no more bad blood on her end. Your move, Taylor.