Biography: Willa Joannachance Holland is an American actress, voice actress, and model. She is best known for her role as Kaitlin Cooper, Marissa Cooper's younger sister, on the television series The O.C. She has also appeared on The CW series Gossip Girl, as Agnes Andrews, and Arrow, as Thea Queen.
Born: June 18, 1991 (age 24), Los Angeles
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