What happens on Sonny With a Chance episode 13?

Chad isfilming a movie about himself and he hires Selena Gomez to play sonny. Sonny isn't happy about this and gets mad that Selena thinks she likes chad. In the end she impersonates Selena and sonny and chad both admit they like each other. Meanwhile grady and nico hang out with the actors cast as them in chads movie , trying to pick up girls!