JUSTIN LONG AND TAYLOR SWIFT "SHAKE IT OFF"

Justin Long

When Taylor Swift, Kate Upton, Amanda Seyfried and Justin Long gathered for a recent Knicks game, Long was caught humming the hit song, “Shake It Off” by none other than T-Swift herself, he told HuffPost Live.

Long: "At one point they were playing that song 'Shake It Off' -- that song, you all know it. It's one of those songs that really gets in your head, really crawls in there."

Long then began humming the tune, forgetting that Swift, who sings the song, was seated right next to him.

Long: "And of course she heard it. And she was like, 'Oh,' and sort of started laughing, and I was so embarrassed."

But Long insists that it wasn't just a ploy to impress New York's newest Global Welcome Ambassador.

Long: "I didn't do it so she would hear me. I wouldn't have done it had I been all that conscious of all that. But she was really sweet about it. She was, like, 'That's the whole point of the album!'"