Her character was only scheduled to appear in a few episodes, but was considered a hit, and ended up being in each of the series.
Summer is, throughout the first few episodes, portrayed as a shallow, materialistic gossip who is ditzy and can have an occasional bitchy nature.
Her character, Summer Roberts, was initially intended to appear in only a few episodes, but became a series regular after a successful run, as Bilson's on-screen romance with Seth Cohen (Adam Brody) became a noted aspect of the series.
It was reported that she called for a body double during the sex scenes because she was uncomfortable being nude in front of the camera. Zoe Hart, a New Yorker who, after her dreams of becoming a heart surgeon fall apart, accepts an offer to work as a general practitioner in the fictional Gulf Coast town of Bluebell, Alabama.
We love the relaxed straight fit, giving them a bit of an androgynous edge. The 29-year-old star - who secretly tied the knot with Adam last year - recently revealed that she had wanted to follow in the footsteps of co-star Blake Lively, who gave birth to her first child last year.
If you want to dress them up a bit though, team with stilettos, a cute tee and a blazer and you'll be ready for a hot date without being a try-hard.
She made her screen acting debut in early 2003, appearing in one episode of Buffy the Vampire Slayer and 8 Simple Rules for Dating My Teenage Daughter. Bilson's first film role was in The Last Kiss, a romantic comedy-drama also starring Zach Braff in 2006.Series creator Josh Schwartz said: "She was adorable and funny and smart, which was a really fresh way to go with that character.