Margaret Grace Denig (born September 21, 1983) in Columbus, Ohio is a American actress, who lives in Los Angeles.

Grace launched her acting career in 2002, starring in Murder in Greenwich and Shop Club. In 2003, aged Grace played the Goth-influenced, estranged daughter of Tom Selleck and Wendy Crewson in the drama 12 Mile Road. Grace’s big break though came when she landed the role of the self-centered Shannon Rutherford in the critically-acclaimed TV series Lost. Grace’s latest project, released in fall was the 2005 horror film, The Fog, in which she co-starred with Tom Welling of Smallville .