The world knew that Ariana Grande can sing. The smaller portion of the world that watched Sam & Cat that one time with their younger cousins knew that Ariana Grande is funny. But the world did not know that Ariana Grande has been hiding a spot-on Jennifer Lawrence impression. Who did she practice this on? Big Sean? Iggy Azalea? The cast of Scream Queens? (Speaking of Scream Queens, how much money would you pay to see Grande’s Lea Michele?)