Mary Willa "Mamie" Gummer (born August 3, 1983) is an American actress. She starred in the title role of The CW series Emily Owens, M.D. (2012–13), and played the recurring role of Nancy Crozier on The Good Wife (2010–15) and its spin-off, The Good Fight (2018). She has also appeared in the films Evening (2007), Side Effects (2013), Cake (2014), and Ricki and the Flash (2015). She was nominated for the 2016 Drama Desk Award for Outstanding Actress in a Play for the original production of Ugly Lies the Bone.