31 People You Forgot Had Cameos In 'The O.C.'
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Prepare to feel extremely old. The final episode of The O.C. aired on Feb. 22, 2007, making it ten years old. It feels completely impossible that it's been a whole decade since we last saw Seth, Summer, Ryan, and Taylor onscreen together. As fans wait not-so-patiently for a reunion of the hit show, it's the perfect time to revisit the incredible list of famous people that cameoed in The O.C. and the list is long! From the indelible Chris Pratt, to an ageless Paris Hilton, The O.C. starred an impressive array of celebrities during its four season run, making it a super fun rewatch.  

Since the Fox show ended in 2007, its main cast have all gone on to bigger and brighter things. Seth Cohen's Adam Brody married the one and only Leighton Meester, while Ryan Atwood's Ben McKenzie took on the role of James Gordon in Gotham. And, of course, Rachel Bilson is as flawless as ever. But what about all of those sneaky guest stars who weren't as famous in 2007, but have since gone stratospheric? Or the actors who cameoed because they were big in the early '00s, but now, not so much? Let's revisit the magic of The O.C., and the stars that made it the iconic series it is.

1. Chris Pratt

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When Pratt appeared in Season 4 of The O.C., he was a familiar face, but nowhere near the star he is today. Revisit the heartthrob, pre-rock hard abs.

2. Olivia Wilde

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An incredibly blonde Wilde wooed Marissa Cooper, a.k.a. Mischa Barton.

3. Shailene Woodley

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Before Willa Holland took over the role, Marissa's little sister, Kaitlin Cooper, was played by Shailene Woodley, which is pretty crazy!

4. Paris Hilton

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The mogul owned her cameo on Season 1 of the show.

5. Logan Marshall-Green

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Before Prometheus, and a plethora of Tom Hardy comparisons, Marshall-Green starred on The O.C. as Ryan's brother Trey.

6. Paul Wesley

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The incredible star of The Vampire Diaries showed up in the first season of The O.C. brandishing a gun. Eek!

7. Cam Gigandet

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Famous for his roles in Twilight, Easy A, and The Magnificent Seven, Gigandet was a regular fixture in Seasons 3 and 4 of The O.C. and eventually was responsible for Marissa's untimely death. Sob.

8. Amber Heard

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Heard appeared in a Season 2 episode, in which she worked in a mall. As we'll soon see her as Mera in Aquaman and Justice League, it's safe to say that Heard's gone on to impressive things since.

9. Jackson Rathbone

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Several Twilight-alum starred in The O.C., including Jasper!

10. Nikki Reed

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Another Twilight stalwart to appear on the show, Reed played Sadie Campbell, a sometime love interest of Ryan Atwood.

11. Lucy Hale

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Before she became Aria Montgomery, Hale played Kaitlin Cooper's roommate at boarding school.

12. Jaime King

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Before Hart Of Dixie, King appeared opposite Rachel Bilson on The O.C. as a surfer who was into Seth.

13. AnnaLynne McCord

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90210's Naomi Clark appeared in Season 3 of the show, and can be seen making out with Cam Gigandet at a party.

14. Kevin Sorbo

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Hercules-himself played Ryan Atwood's dad. What perfect casting!

15. Max Greenfield

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Schmidt from New Girl played Sandy Cohen in a flashback episode of The O.C., which gave viewers an insight into his love story with Kirsten. In an extremely meta turn of events, Peter Gallagher was cast as Schmidt's dad in New Girl, bringing the Sandy Cohen story full circle.

16. Morena Baccarin

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The Homeland actor once appeared on The O.C., before starring opposite Ben McKenzie on Gotham. Baccarin and McKenzie are also a real-life couple now, thanks to Orange County.

17. Bella Thorne

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Thorne played a young Taylor Townsend on the show, and totally killed it.

18. Steve-O

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The Jackass star did shots with Adam Brody. Respect.

19. Ashley Benson & 20. Janel Parrish

The Pretty Little Liars co-stars first worked together on an episode of The O.C. during Season 4.

21. Chris Brown

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Brown played a nerd in Kaitlin Cooper's class. Enough said.

22. Colin Hanks

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Hanks had an important role on Season 1 of the show, as Grady Bridges, the star of Summer's favorite TV show, "The Valley".

23. Jeffrey Dean Morgan

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The beautiful Jeffrey Dean Morgan played Joe, an old acquaintance of Sandy's who ended up in prison. That beard, though.

24. Kat Graham

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Before starring in The Vampire Diaries, Graham appeared in an episode of The O.C. in 2006.

25. T.I.

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The rapper performed at a spring break pool party on the show in Season 2.

26. Emmanuelle Chriqui

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The Entourage actor played Olivia Wilde's ex-girlfriend on The O.C., which sounds like a pretty great job!

27. Willa Holland

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Taking over from Shailene Woodley, Holland played Marissa Cooper's sister Kaitlin from Season 3 onwards. Since appearing on The O.C., Holland has appeared in some super popular TV, including Gossip Girl and Arrow.

28. Shannon Lucio

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Lucio played Lindsay, Caleb Nichol's secret child on the show, and had a brief romance with Ryan, which involved a lot of kissing. Lucky!

29. Chris Carmack

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Nashville's Will Lexington was a big part of Season 1 of The O.C., playing Marissa's long-term boyfriend Luke.

30. Jeri Ryan

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Star Trek's Seven of Nine played Charlotte Morgan on the show, a woman that met Kirsten Cohen in a rehab centre, and attempted to scam money from her.

31. George Lucas

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Incredible.

The ten year anniversary of The O.C.'s finale is the perfect excuse to watch the entire series all over again, if only to spot all of the celebrities in it.