Mackenzie Christine Foy (born November 10, 2000) is an American actress and model. She is known for portraying 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. She portrayed young Murphy in the 2014 space epic Interstellar, for which she received a Saturn Award for Best Performance by a Younger Actor among other awards nominations. She starred as Clara in Disney's 2018 film The Nutcracker and the Four Realms.