Jennifer Michelle Goodwin (born May 22, 1978), known professionally as Ginnifer Goodwin, is an American television and film actress.She is best known for her role as Margene Heffman on Big Love, and for her roles in films like Mona Lisa Smile, Something Borrowed, Walk the Line, and He's Just Not That Into You. She stars as Mary Margaret Blanchard/Snow White in the ABC series Once Upon a Time.