Don't mess with Taylor Swift's cat!

When British actor John Cleese took a swipe at the "Shake It Off" singer's cat on the Graham Norton Show, Swift went silent at the actor's rudeness.

"How did it have the accident?" Cleese asked Swift after being shown a picture of Olivia Benson, the singer's cat named after Mariska Hargitay's "Law and Order: SVU" character.

"What accident," an annoyed Swift replied.

"Is that a proper cat? That's the weirdest cat I've ever seen in my life."

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Watch what happened when the 24-year-old defended her cat in the video below.