Rachel Sarah Bilson is an American actress most well known for her role as Summer Roberts in the hit series The O.C. The 29 year old is also famous for her absolutely stylish fashion choices and being the fiancée of Hollywood heartthrob Hayden Christensen, her leading man in the action/sci-fi film Jumper. Even now that her TV series has been off the air for quite a couple of years already, Hollywood still can’t help but take notice of Rachel Bilson for her svelte figure. So we had to ask, what is Rachel Bilson’s diet plan and fitness exercise program that […]