The Amazing Spider-Man 2 actress replied to the opening number with Blues Traveler’s “Hook”, which starts off quite easy...
But speeds up pretty quickly.
For Fallon’s second, and final song, he went with Styx’s “Mr Roboto”.
But it wasn't a scratch on what Emma had planned for her final song - DJ Khaled’s "All I Do Is Win”.
She even did Ludacris' part.
Sorry Jimmy, there was only ever going to be one winner.
Watch the Lip Sync Battle in all its glory here: