Armstrong was born in Tokyo to a Scottish father, Hunter Armstrong, and an Italian mother, Sylvia Sepielli. Her mother designs spas for resorts and her father teaches soldiers close combat training. Armstrong lived in Japan for five years, before moving to Hawaii and later Sedona, Arizona where she grew up and attended Sedona Red Rock High School. She has also lived in Malaysia and China.\n', '

In 2000, Armstrong made her television debut guest starring in an episode of the teen drama television series Party of Five portraying Meredith. Throughout 2000 to 2001, Armstrong made guest roles on high-profile television shows such as The X-Files, ER, Judging Amy and Freaks and Geeks.\n', '

In 2003, Armstrong was cast in the role of Anna Stern on the Fox teen drama television series, The O.C.. Armstrong was intended to only appear in one episode. However, after her character proved to be a fan favorite, she was brought back to appear in several more episodes. She portrays the role of a self-confessed comic book reader and a sarcastic socialite from Pittsburgh who is a recurring love interest for Seth Cohen. Despite the regular appearance of her character throughout the series first season, she was not promoted to series regular. In 2006, Armstrong was confirmed to return for the series third season for two episodes. She did not return to the series which was cancelled after its fourth season.\n', '

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