Some of our favorite stars have clearly stumbled upon the fountain of youth. How else do you explain the fact that they seemingly don't age? Styles may change, but celebs like Jennifer Lopez, Rob Lowe and Kate Hudson inexplicably look the same today as they did a decade (or more!) ago. Keep reading to check out more of Hollywood's ageless wonders, starting with Rachel Bilson. This actress -- who turns 35 on Aug. 25, 2016 -- shot to fame in 2003 when she landed the role of lovable Summer Roberts on "The O.C." She's been in Hollywood now for more than a decade, yet the mother of one looks like she's hardly aged a day.