Kristen Anne Bell (born July 18, 1980) is an American actress and film producer. In 2001, she made her Broadway debut as Becky Thatcher in The Adventures of Tom Sawyer. After moving to Los Angeles, Bell landed various television guest appearances and small film parts before appearing in a lead role in the David Mamet film Spartan. She later gained fame and critical praise as the title character on the television series Veronica Mars from September 2004 to May 2007 and will reprise the role in the 2014 film based on the series. During her time on Veronica Mars, Bell appeared as Mary Lane in the film Reefer Madness: The Movie Musical, a reprise of the role she had played in the New York theatrical production of the eponymous musical upon which the film was based. She also portrayed the lead role in Pulse, a remake of a J-Horror film. In 2007, she joined the cast of Heroes, playing the character Elle Bishop, and Gossip Girl as the off-screen titular narrator. In 2008, she played Sarah Marshall in the comedy film Forgetting Sarah Marshall. She has since appeared in a number of comedy films, such as Fanboys, Couples Retreat, and When in Rome. Bell was also the voice of Cora in Astro Boy and is the voice and face of Lucy Stillman in the Assassin's Creed video game series. Bell has received a Satellite Award and Saturn Award, and has been nominated several times for Television Critics Association Awards and Teen Choice Awards. Bell currently stars as Jeannie van der Hooven in the Showtime series House of Lies.

She has since appeared in a number of comedy films, including Couples Retreat (2009), When in Rome (2010), You Again (2010), The Boss (2016), Bad Moms (2016), and A Bad Moms Christmas (2017). Bell garnered further recognition for voicing Princess Anna in the Disney animated fantasy films Frozen (2013), Ralph Breaks the Internet (2018), and Frozen II (2019), and the short films Frozen Fever (2015) and Olaf's Frozen Adventure (2017).

From 2012 to 2016, Bell starred as Jeannie van der Hooven, the female lead on the Showtime comedy series House of Lies. From 2016 to 2020, she starred in the lead role of Eleanor Shellstrop on the acclaimed NBC comedy series The Good Place, for which she received a Golden Globe Award nomination for Best Actress – Television Series Musical or Comedy.