Margaret Grace Denig is an American actress and model. She is known for playing Shannon Rutherford on the ABC television series Lost (2004–2006; 2010), Kim Mills in the Taken trilogy (2008–2014), Irina in The Twilight Saga (2011–2012), and Althea Szewczyk-Przygocki in Fear the Walking Dead (2018–2021).
Grace earned a Young Artist Award nomination in 2002 with her portrayal of 15-year-old murder victim Martha Moxley in the television movie Murder in Greenwich. In 2004, she was cast as Shannon Rutherford in the television series Lost, on which she was a main cast member for the first two seasons, winning a Screen Actors Guild Award shared with the ensemble cast. Leaving the series, Grace was keen to work more prominently in film. She appeared in The Jane Austen Book Club (2007), and opposite Liam Neeson as Kim Mills in Taken in 2008. She reprised the role of Kim in Taken 2 (2012) and Taken 3 (2014).
She played the lead role, Alice, in Malice in Wonderland, a modern take on Lewis Carroll's novel Alice's Adventures in Wonderland. Grace reprised the role of Shannon in two more episodes of Lost, including the series finale. In 2013, she appeared in the sixth season of Californication. She portrayed Faith, a groupie and a muse to the stars, who captures the eye of Hank Moody, played by David Duchovny. She joined the cast of the series Fear the Walking Dead in 2018 as a journalist named Althea.