She only did it, like, "about 100 times" during a 3-hour breaking while shooting Zoolander 2 (plug, plug, plug), and it's only her "favourite thing to do in the world ever." All you need to do is observe some of her previous work to see that she's a pro at the app - and nothing short of addicted. 

OK, so the blonde with and the beret aren't technically the correct props for the Dubsmash herself and Jimmy duet on, but their sheer talent shines through. Perfection.