I dont know what this song is called?

I watched it on the itunes countdown and i thought it was called letter to juliet or dear juliet or something like that and the band sounded kinda like red jumpsuit apparatus.. and in the film clip there was a girl and she snuck out of her room to go to a house party where the band was playing.. I know this isn't a lot of information but im going insane trying to remember what the song was called!!