Everything You Need To Know About This Taylor Swift & Katy Perry Feud

Back in the day everything was peachy in the world of Taylor Swift and Katy Perry's friendship…

They'd act all like 'Omg we are just so excited all the time' when they saw each other at awards shows…

Go out for dinner together in questionable dresses in London…

Do that really awkward thing when you've not seen someone in ages and just hold each other's hands…

But that didn't seem to mean anything to KP when she decided to steal T-Swift's backing dancers from under her…

Which we all found about when Taylor penned Bad Blood, and explained to Rolling Stone what really happened (without mentioning any names)…

Taylor said: "It wasn't even about a guy! It had to do with business. She basically tried to sabotage an entire arena tour."

Adding: "So now I have to avoid her. It's awkward, and I don't like it."

Katy couldn't resist sending out a cryptic tweet in retaliation to the much talked about interview, in true Mean Girls style…

Oh and then she threw serious shade during her Super Bowl performance, with back dancers dressed uncannily like Swift…

KP has now reportedly written a diss track titled '1984', with a matching video a la Bad Blood. We wonder what Tay Tay will respond with next?!

After the announcement of the VMA nominees, things got a little bit heated on Twitter as Taylor started a row with Nicki Minaj. It didn't take long for Katy Perry to throw some shade at Taylor with her own tweet on the matter.

Taylor then appeared to take a swipe at Katy in Massachusetts on her 1989 tour. The singer was joined onstage by someone dressed up as a shark during 'Bad Blood'. Fans immediately made the link to Katy's infamous Left Shark from her Super Bowl show.