Jimmy Fallon and Jack Whitehall backstage with Caissie Levy (Elsa) and Patti Murin (Anna) after Jack Whitehall’s surprise cameo in the Broadway smash Frozen at the St. James Theatre on Friday, March 1st. The appearance was captured for “The Tonight Show’s” March 1st broadcast.

Photo A: (L to R) Jack Whitehall, Caissie Levy (Elsa), Patti Murin (Anna), and Jimmy Fallon. Photo by Andrew Lipovsky/ NBC

Photo B: (L to R) Caissie Levy (Elsa), Patti Murin (Anna), and Jimmy Fallon. Photo by Andrew Lipovsky/ NBC