The actor recently told HuffPost Live all about how the song is always stuck in his head. Glad we aren't the only ones! He also spilled how Tay Tay totally called him out for humming to it randomly while at the game.
"It's one of those songs that really gets in your head, really crawls in there," he said about the anti-haters song. "Of course she heard it, she was like 'Oh,' and sort of started laughing, and I was so embarrassed."
Justin swears he wasn't trying to impress Taylor with his singing skills or anything. He actually didn't even realize he was humming her song.
This whole moment obviously went down during the same game Taylor was snapped hanging out at the with Amanda and crew. We're sure she supports her BFF in their household, so that's why Justin knew the tune, right? Riiiight. Tay's epic response to it all? "That's the whole point of the album!"
Have you caught yourself just shake, shake, shaking it off lately? We do it more than we probably should...
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Gallery | Taylor Swift's Famous BFFs