I cannot even really explain the joy I felt upon reading that Rachel Bilson and Mischa Barton actually went to high school together. Please don't rain on my parade by explaining that Bilson is 5 years older and therefore they never actually overlapped; just let me have my dream for a moment. Right here in New York City, Summer and Marissa kind of sort of real life lived the OC. Where, you ask, and what other famous went there:

PROFESSIONAL CHILDREN'S SCHOOL
132 West 60th Street, Upper West Side
Mischa Barton, Jordana Brewster, Rachel Bilson, Sarah Michelle Gellar, Julia Stiles, Christopher Walken, Uma Thurman and Scarlett Johansson

Brilliant. In my head these ladies (other than Walken, who is just standing in the corner acting like a nutjob and freaking the shit out of all the hot girls) roamed the halls in a pack somehow bridging the divide between the cool kids and the drama kids. Mischa and Rachel play their exact parts from the show, clearly. Sarah Michelle Gellar was the cheerleader. Uma Thurman, the hot athletic one who slept with all the cool older guys. Julia Stiles was always almost a popular girl, but never quite, and tried too hard at parties, often resulting in embarrassing dignity-less moments. And Scarlett Johansson smoked cigarettes in the parking lot and was rumored to give blow jobs for cocaine.

[Source]