What really goes on behind the sets of our favorite TV shows and movies? Thanks to stars who tweet and use Instagram, now we know! In the case of Modern Family's Sarah Hyland, they make funny faces. Turns out Ryan Seacrest's staff makes a habit of wearing birthday hats. Meanwhile over at 2 Broke Girls, Kat Dennings is getting put to work. Check out all the latest behind-the-scenes pictures from this week!