Jimmy Fallon and Selena Gomez Dub Smashing is Hilarious

If you haven't used or heard of Dubsmash you are seriously missing out. It's an awesome app that lets you lip sync music or lines from movies or TV.  Lots of celebrities use it and my sister is absolutely addicted to it. Watch the video below to watch Jimmy Fallon and Selena Gomez use it on the Tonight Show.