43 years old (Born on August 25, 1981)
Happy Birthday, Rachel Bilson! From stealing our hearts as the sassy Summer Roberts in "The O.C."—where your witty comebacks and iconic fashion sense made teenage drama feel hilariously relatable—to charming us all over again as Dr. Zoe Hart in "Hart of Dixie," you've proven that small-town chaos can be just as entertaining (and fashionable!) as California beaches.Whether you're delivering unforgettable one-liners or navigating quirky Southern townsfolk with comedic grace, you always bring warmth and humor to every role. Here's hoping your birthday is filled with fewer dramatic love triangles than Newport Beach—and way more cake!