As a guest on The Tonight Show Monday, the apparently multi-talented Elgort revealed one of his hidden tricks: The kid's a hoofer!
Elgort pulled out some Astaire-like tap-dance steps, which were quickly mimicked by Fallon, though with slightly less flair.
Tap isn't Elgort's only talent, though – the 20-year-old New York native once performed in The Nutcracker at Lincoln Center and has played piano his entire life. (He released an album, Unite, in April.)
Elgort's next role is in the Divergent sequel, Insurgent, in which he again shares the screen with Stars costar Shailene Woodley.