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Hailee Steinfeld Source at hailee-steinfeld.com, your ultimate online source for everything Hailee Steinfeld. She is an American actress, model and singer. She is best known for her portrayal of Mattie Ross in the 2010 film True Grit, for which she was nominated for the Academy Award for Best Supporting Actress, the Screen Actors Guild Award for Outstanding Performance by a Female Actor in a Supporting Role, and the BAFTA Award for Best Actress in a Leading Role.