Rachel Bilson is one of those stars who just doesn't age. She won over our hearts as Summer Roberts on The O.C. in 2003, when she was 22, and now, more than a decade later, she still looks almost exactly the same at 32. These days, she's no longer playing a teenager — instead, she's a hot young doctor on Hart of Dixie — and in real life, she's expecting a baby with her boyfriend, Hayden Christensen. Test your knowledge below to see if you can tell if Rachel is over or under 26 years old in the photos. You may be surprised by the results! Source: Getty

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