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What All The Cast Members Of 'The O.C.' Are Up To Now

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Willa Holland
Willa Holland played Marissa's younger sister, Kaitlin. While Marissa gravitated toward her dad, Kaitlin was definitely cut from the Julie Cooper cloth. A bit of a wild child with a major attitude, Kaitlin matures as the series progresses. Fun fact: Kaitlin's character was played by Shailene Woodley in the first season.