Andy Cohen claims Taylor Swift snubbed Katy Perry at this year's MET Gala.

The 26-year-old musician and the 'Roar' hitmaker have had a long-running feud since ever since Taylor claimed Katy, 32, pinched three of her backing dancers from her 'Red Tour' in 2012, and things haven't cooled off since.

Now, 'Watch What Happens: Live' host Andy, 48, has claimed the 'Blank Space' hitmaker let him know that Katy was the ''exact opposite of her friend'' when they both attended the glitzy MET Gala in New York earlier this year.

Writing in his upcoming book 'Superficial: More Adventures from the Andy Cohen Diaries', the talk show host wrote: ''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.' ''

According to Andy, the 'Bad Blood' singer replied: ''Katy who?''

And Andy then writes: ''I said, 'Perry,' at which point she clearly let me know that she's the exact opposite of her friend.''

Andy also claims the 'Shake it Off' musician told him not to mention their exchange on his talk show, but didn't ''threaten'' him about mentioning it in his book.

He added: ''She didn't threaten me about putting it in my book, so here we are.''

Katy showed signs earlier this year that she is ready to make up with the 26-year-old pop star by offering to collaborate with her if she apologises.

The 'Dark Horse' musician seems happy to end her ongoing feud with Taylor and has held out an olive branch by announcing that there is a chance they could work together in the future.

When asked in a Twitter Q&A if she would work with Taylor, Katy replied: ''If she says sorry, sure!''