Rachel Sarah Bilson (born August 25, 1981) is an American actress. Bilson grew up in a California show business family, and made her television debut in 2003, subsequently becoming well known for playing Summer Roberts on the prime time drama series The O.C. Bilson made her film debut in the 2006 film The Last Kiss and starred in the 2008 action/science fiction film Jumper.
Bilson and Adam Brody, her co-star on The O.C., dated for three years, ending in 2006. She met Hayden Christensen on the set of Jumper in 2007 and became engaged in 2008. In mid-2010, the couple split up, but were dating again a few months later.