Everyone knows that dirty girls are better at everything. If she grew up in a single-wide or on the other side of the tracks, you’ve hit a goldmine. Even on the big screen, some actresses can tap into their own trashy persona a little too well. Riley Keough, Emmy Rossum, Jaime Pressly, Juliette Lewisand Brittany Murphymade our list by being so good at being bad we forgot they were acting.