Emma Stone defeats Jimmy Fallon in "Tonight Show" lip-sync battle

Stop whatever else you're doing this morning, because this lip-sync battle between Emma Stone and Jimmy Fallon is a must-see.

The "Tonight Show" host has done these battles before -- with Joseph Gordon-Levitt and Paul Rudd among the highlights -- but this might be the best one yet.

Stone, promoting her new film "The Amazing Spider-Man 2," started off with Blues Traveler's "Hook" for her first song before launching into DJ Khaled's "All I Do is Win" -- including the super-fast verse from Ludacris.

Her facial expressions, the spot-on lip-syncing...the whole thing is pretty much perfect. And Fallon agreed -- the host, admitting defeat, declared it "the best one [lip-synching performance] that's ever been done on the show ever."

Watch their performances below: