Laura Helene Prepon (born March 7, 1980) is an American actress. She rose to fame with her role as Donna Pinciotti in the Fox sitcom That '70s Show (1998–2006). She is also known for portraying Alex Vause in Orange Is the New Black (2013–2019). Prepon made her film debut in 2001 with the independent drama Southlander. Her other films include Come Early Morning (2006), Lay the Favorite (2012), The Girl on the Train (2016), and The Hero (2017).