Lilli Cooper (born March 4, 1991) is a New York City-born actress. She played Elphaba in the Australian tour of Wicked, and originated the role of Martha Bessell in Spring Awakening. She is the daughter of actor Chuck Cooper. She also played Hélène Kuragina in the American Repertory Theatre production of Natasha, Pierre & The Great Comet of 1812 in 2015. She originated the role of Sandy Cheeks in the Broadway production of SpongeBob SquarePants, which opened on December 4, 2017.