I don't watch the Tonight Show all too often, but I caught a promo announcing that Emma Stone would be on. She's one of my girl crushes, so I tuned in and was duly rewarded with a lip sync battle of epic proportions.
Ms. Stone's first selection was "Hook" by Blues Traveler, which was hilarious, then hilariously appropriate. Her final song, which clinched the lip sync-off victory, was "All I Do is Win" by DJ Khaled, featuring Ludacris.
Here, for your listening and viewing pleasure, is the video. :-)
ETA: And, Kinja won't let me embed the video, but follow the link for awesomeness. :-)