Alison Elizabeth "Ali" Larter (born February 28, 1976) is an American actress, best known for her dual roles as Niki Sanders and Tracy Strauss in the NBC science fiction series Heroes.

She also appeared in guest roles on several television shows in the 1990s. Her screen debut came in the 1999 film Varsity Blues, followed by the horror films House on Haunted Hill and Final Destination. Major supporting roles in the comedy Legally Blonde and the romantic comedy Just Friends led to her leading roles — the title character in the Bollywood film Marigold and in the 2009 thriller Obsessed. Larter gained wider recognition after playing the video game heroine Claire Redfield in the hit films Resident Evil: Degeneration and Resident Evil: Afterlife. Larter frequently appears on the "hottest" celebrity lists compiled by Maxim, FHM and Stuff, as well as in People magazine's "Best Dressed" list in 2007. After a three-year relationship, Larter married actor Hayes MacArthur in a modest ceremony in Maine in August 2009. The couple have a son, born in December 2010.

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