Happy 30th Birthday, Rachel Bilson! (PHOTOS)

Rachel: White Swan!
Rachel Bilson wows for a commerical.
Our favorite celebs are growing up so fast! Today (Aug 25), Rachel Bilson celebrates her 30th birthday! It seems like just yesterday that the sexy brunette first got our attention when she was cast as Summer Roberts in CW’s The O.C.

Even after the sun set on the hit teen drama, Bilson proved too big for the small screen, making her film debut in the 2006 film The Last Kiss. Of course, the 30-year-old actress has come a long way, but her beauty still reigns — taking such titles as Sexiest Women in the World and People magazine’s “100 Most Beautiful People” and “Most Beautiful Faces.”

The 5’2″ actress has also packed quite a punch with her fashionable style, too. The trendsetter paired up with fashion designer Karl Lagerfeld earlier this year — for a Magnum ice cream short-film. She also appeared as a celebrity guest judge on Project Runway.

The year ahead appears to be a new chapter for the actress, who is set to star in a new The CW series called Hart of Dixie created by The O.C. creator Josh Schwartz. Guess everything comes full circle, right?

Take a look back at some of Rachel’s sexiest looks in our gallery and be sure to wish her happy birthday in the comments!