Mackenzie Christine Foy (born November 10, 2000) is an American model and actress. She is best known for her role as Renesmee Cullen in the 2012 film The Twilight Saga: Breaking Dawn – Part 2, which earned her a Young Artist Award nomination as Best Supporting Young Actress in a Feature Film, and as the young Murphy in the 2014 space epic Interstellar, for which she received critical acclaim and several awards and nominations.