Taylor Swift
Taylor Swift performs in Times Square on New Year's Eve in New York, New York, U.S. December 31, 2014. Reuters/Carlo Allegri

TV host Andy Cohen is always in the midst of celebrities, which allows him to experience the feuds, relationships and awkward run-ins first-hand. And in his new book, entitled “Superficial: More Adventures from the Andy Cohen Diaries,” he shares just how Taylor Swift treated Katy Perry during the the Met Ball.

In an interview with Entertainment Tonight, Cohen revealed that he knew that his book might push some of Hollywood’s A Listers to give him the silent treatment and that he was “worried” about it. “People are going to be pissed, because I'm really revealing a lot," he confessed. "I'm moving the goal post, and I just feel like if I'm going to do it again, it has to be bigger and better and dishier.”

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In the book, Cohen discussed how he had a run-in with Swift at the 2016 Met Ball, where the “Bad Blood” singer was looking for a spot to watch Lady Gaga’s performance. Cohen went up to Swift and pointed out that Perry had a open spots near her. “Your friend Katy is sitting in the corner and there’s plenty of room around her,” he recalls telling her. “Katy who?” Taylor asked.

After Cohen clarified who he meant, Swift apparently made it clear that “she’s the exact opposite of her friend.” Cohen then pointed out how Swift requested him not to use their conversation as material for “Watch What Happens Live.”

"She didn't threaten me about putting it in my book, so here we are," he reasoned.

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“Superficial” also touched on what could have been an awkward moment between exes Jennifer Aniston and John Mayer during the “Friends” reunion in February. However, Mayer decided not to greet the cast with Cohen. The 48-year-old personality also discussed how he had to decline an invitation from Oprah twice -- once for an appearance on “Oprah: Where Are They Now?” and another for brunch at Santa Barbara, California.