Portia Doubleday is an American actress who was born in Los Angeles, California, USA. Her father is an actor whose most notable performances were in John Carpenter's movies: Assault on Precinct 13 (1976) and Escape from New York (1981). Her mother is an actress who has been acting since the age of nine. Her mother, Christina Hart, has appeared in minor roles in many popular TV series such as: Incredible Hulk, Three's Company, CHiPs, Dynasty, Airwolf, Murder She Wrote. Her sister, Kaitlin Doubleday, is also an actress who has appeared in films such as: Accepted, Waiting..., Catch Me If You Can.
Her first exposure to show business came at the age of eight when she appeared in a commercial for Pepperidge Farm's Goldfish crackers. Her first film appearance was a minor role in the film Legend of the Mummy (released in 1997). In the movie, Amy Locane played the character of Margaret Trelawny and Portia was cast as a young Margaret.
According to an interview in the Houston Chronicle, her parents wanted their daughters to at least finish high school before pursuing acting as a full time career. Portia followed her parents' wishes and graduated from LACES High School in Los Angeles. After graduating from high school, she enrolled in college to study psychology. She was cast for a pilot episode for the TV show: United States of Tara (created by Diablo Cody of Juno fame). However, she did not make it past the pilot episode. Her big break came in the middle of her sophomore year in college when she was picked for the film: Youth In Revolt. The film is based on a novel: Youth in Revolt: The Journals of Nick Twisp by C.D. Payne (1993). Portia was cast as Sheeni Saunders, the love interest for the character Nick Twisp played by Michael Cera (Superbad). Youth In Revolt is directed by Miguel Artera.