At this point, everyone kinda knows that there is serious bad blood (no pun intended) between Taylor Swift and Katy Perry. But up until now, we haven’t actually heard of any real beef happening IRL. 
But that all is about to change because according to Cosmopolitan, Taylor Swift apparently shaded Katy Perry big time at this year’s Met Gala.
Andy Cohen, the Watch What Happens Livehost, revealed in his new book, Superficial: More Adventures From the Andy Cohen Diaries, that Swift did not respond well when he approached her and made a joke about her sitting with Katy.
He writes, "Why I felt I needed to get involved I will never know (maybe I was auditioning for her squad?) but I innocently said exactly the wrong thing to her, which was, 'Your friend Katy is sitting in the corner and there's plenty of room around her,’” and then Swift promptly responded “Katy who?” Mic drop.
"I said, 'Perry,' at which point she clearly let me know that she's the exact opposite of her friend," Cohen adds.
And it doesn’t stop there. Cohen also said that Swift asked him to please not mention this exchange in his book but "She didn't threaten me about putting it in my book, so here we are."
Everyone get ready because the party is just getting started.