Hometown: Los Angeles, Calif.

Get To Know Her: The 21-year-old Cali girl stars in Youth in Revolt, playing Sheeni Saunders, a whimsical high schooler who manipulates classmate Nick Twisp (Michael Cera) into becoming a rebel (setting fires, blowing things up, etc.) in exchange for the possibility of having sex. It will be the first time a mass audience will be able to see Portia in action on the big screen...unless you count her small part in the direct-to-video film adaptation of Bram Stoker's Legend of the Mummy. (Don't count it. Or rent it.)

On Becoming an Actress: "Because I grew up in a film family, I never asked any questions about the business. It was what my parents and my sister did for a living, and kids are never curious about those things." —Via The Star

Need more movies to check out this year? Follow our list of 20 movies to watch in 2010.

Portia Doubleday

Portia Doubleday

Portia Doubleday

Portia Doubleday

Portia Doubleday

Portia Doubleday