Bilson was born in Los Angeles, the daughter of Janice Stango, a therapist, and Danny Bilson, a writer, director, and producer. She has an older half-brother and two younger half-sisters, Hattie and Rosemary. … See more

Bilson attended Grossmont College, a community college in a suburb of San Diego, taking her father's advice to pursue a professional acting career. She then made several appearances in commercials, including a… See more

Bilson and Adam Brody, her co-star on The O.C., dated from 2003 to 2006.
In November of 2006, Bilson began a relationship with actor Hayden Christensen, with whom she had co-starred in the film Jumper. … See more