Laura Prepon ( born March 7, 1980) is an American actress, best known for her role as Donna Pinciotti in the long-running Fox situation comedy That '70s Show, for all eight seasons. She is also known for the role of Hannah Daniels on the ABC drama October Road. She has voiced characters in animated TV series such as American Dad! and King of the Hill, as well as a character in the video game Halo 2. Following That '70s Show, Prepon worked mainly in television, guest-starring in episodes of How I Met Your Mother, Medium, and Castle. In 2011, Prepon began filming the comedy series Are You There, Chelsea?, based on Chelsea Handler's 2008 book Are You There, Vodka? It's Me, Chelsea. Prepon plays Chelsea in the series, which debuted on January 11, 2012.
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