While Resting Bitch Face is something you're born with or not, Bitch Face, that versatile tool to be deployed late at night on the train or whenever you're seriously displeased, can be learned.
During Friday's Tonight Show, Emma Roberts attempted to impart some of her wisdom by explaining the narrow-eyes, mouth-twitch, hair-flip combo that seals the bitchy deal.
Practice all you want Jimmy, but an effective bitch face comes from within.