We'd imagine that the luminous Emma Stone was on The Tonight Show on Monday to promote The Amazing Spider-Man 2 which opens later this week. But all we can remember from her appearance is the lip sync faceoff she had with host Jimmy Fallon.

Ina word: Wow!

Jimmy went first, throwing down the gauntlet with Iggy Azalea's "Fancy" (shoutout to Philly!). Emma calmly stepped up to the mic and buried him an obscure classic, "Hook" by Blues Traveller.

Both mock vocalists were just warming up. Jimmy came back strong, with Styx's "Mr. Roboto" ending on a punishing high note. Game, Mr. Fallon?

We won't spoil Emma's master-stroke response, except to say that the title was prophetic: "All I Do Is Win". This is just crazy good, Ludacrisly good.

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