The O.C. was the It show on TV just 10 years ago and a ton of your favorite stars were a part of it! Before we knew Bella Thorne from Disney Channel's Shake It Up or Blended, she was in an episode of the FOX teenage drama show starring the now married Ben McKenzie, Mischa Barton, Adam Brody, and Rachel Bilson (who now is a mom BTW!).
Tons of other unexpected faves appeared on the series too, so we're about to take you down memory lane. There's a Pretty Little Liars starlet before she was ever you know, trying to figure out who is out to get her and her friends and little Shailene Woodley is just the cutest.
Click through to see more of your favorite stars who were on the show and you literally have no idea until now!