Watch Taylor Swift and Jimmy Fallon Bust a Move on Jumbotron [VIDEO]

After singing together with Paul McCartney after Sunday night's Saturday Night Live 40th Anniversary special, Taylor Swift and Jimmy Fallon are becoming real BFF's!  Watch what happens when the famous New York Knicks Dance Cam catches the pals gettin' down in the stands of a basketball game! (I mean, I think you can call that dancing, lol.)