Elizabeth Anne Caplan is an American actress and model. Her first acting role was on the cult television series Freaks and Geeks . She received wider recognition with roles in the films Mean Girls and Cloverfield , the latter of which earned her a nomination for the Saturn Award for Best Supporting Actress. Caplan has also starred on the TV shows Related, The Class, and Party Down. From 2013 to 2016, she played Virginia E. Johnson on the Showtime series Masters of Sex, a role for which she received nominations for a Primetime Emmy, two Satellite Awards, and a Critics' Choice Award.