Rachel Bilson sex scene scare.

Rachel Bilson - who appears alongside 'Scrubs' star Zach Braff and Ben Affleck's brother Casey in the movie 'The Last Kiss' - was scared to film sex scenes with Zach Braff.

The brunette - best known for her role as ditzy Summer Roberts in'The O.C. - gets up close and personal with the 'Scrubs' actor in 'TheLast Kiss', a remake of an Italian film.
Rachel claims it was "awkward" shooting the raunchy scenes because she and Zach didn't know each other very well.
She revealed to Cosmopolitan magazine: "I was really nervous because this was my first big sex scene. I play a temptress who pursues Zach's character. It was a little awkward, it was like, 'Hello, nice to meet you, let's get into bed.'"
The 25-year-old actress also refused to strip off for the sexy scenes - because she was afraid she would lose credibility as a serious movie actress.
She said: "The filmmakers wanted me to take everything off but I wasn't interested in doing that for my first role. They agreed in the end and there was no nudity, nothing too raunchy."

Meanwhile, Rachel Bilson wants to quit the O.C..

The brunette actress, who plays Summer Roberts in the hit US series, admits
she has lost her enthusiasm for the role that rocketed her to fame and feels
it might be the right time for a new challenge.
She said in an interview with Teen Vogue magazine: "I just feel like the
show is over. I'm so happy for everything it brought me, and it's been such
a great experience, but I think we're all ready to move on."

Rachel's co-star Mischa Barton, who played Marissa Cooper, has already left
the show to pursue a movie career.
Bilson admits it was nerve wracking
making the transition from the small screen to the big screen.