Olivia Jo Thirlby (born October 6, 1986) is an American actress. She is best known for her roles as Leah in the comedy-drama film Juno (2007),  as Natalie in The Darkest Hour (2011) and as Judge Cassandra Anderson in Dredd (2012). In June 2008, Thirlby was described by Vanity Fair as a member of "Hollywood's New Wave". She made her stage debut in Farragut North, a play by Beau Willimon at the Atlantic Theater Company in New York City. She also appeared in the 2011-released film Margaret. She is attached to star in Christmas in New York as well as For Ellen. Thirlby starred in the Russian science-fiction film The Darkest Hour, released in 2011, directed by Chris Gorak, and produced by Timur Bekmambetov. Thirlby was also cast in the lead role of Max in the upcoming drama comedy The Other Side. With Karl Urban in the title role, Thirlby starred as Judge Cassandra Anderson in the 2012 film adaptation of Judge Dredd. She next starred in the indie film Nobody Walks co-starring John Krasinski and Rosemarie DeWitt. She plays Martine, a young artist taken in a couple's home. It premiered at 2012 Sundance Film Festival. In 2016, Thirlby co-starred as the young attorney Lucy Kittridge in the Amazon Studios legal series Goliath.

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