Andy Cohen just revealed that Taylor Swift channeled Mariah Carey when he asked her about Katy Perry.

The “Watch What Happens Live” host recounted the incident in his new book, “Superficial: More Adventures from the Andy Cohen Diaries,” according to Entertainment Tonight. Cohen said he approached Swift at the 2016 MET Gala because he wanted to encourage her to sit next to Perry.

“[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,” Cohen said.

The host continued, saying Swift pretended she did not know which Katy he was referring to—similar to what Carey usually pulls when asked about Jennifer Lopez. Carey always answers questions about her reaction to Lopez with, “I don’t know her.” In Swift's case, she pretended not to know who Perry is, asking Cohen, “Katy who?” 

“I said, ‘Perry,’ at which point she clearly let me know that she’s the exact opposite,” Cohen said.

There has been an unproclaimed and silent feud going on between Swift and Perry for years now. Swift’s ex-boyfriend Calvin Harris even addressed the rift shortly after he and the “Shake It Off” singer called it quits. Harris said in a now-deleted tweet that he understands that Swift can no longer come for Perry like she did the previous summer, but he does not appreciate that she is targeting him instead.

Talks about the feud started swirling when Swift came out with the song “Bad Blood.” In an interview with Rolling Stone, the singer said that contrary to what people believe, it’s actually about a former friend, not a lover. Many assumed it was Perry, although Swift did not name her directly.

Perry seemingly confirmed that she is the subject of Swift’s song when she tweeted “Watch out for the Regina George in sheep’s clothing…” shortly after Swift’s interview came out.

The feud reportedly started when Perry hired dancers who previously worked with Swift.