Stella Maeve Johnston is an American film and television actress from Nyack, New York.
Her first feature film role was in the comedy–drama Transamerica, and she has since acted in the comedy Harold and the crime drama Brooklyn's Finest. She has made appearances on multiple television series, including recurring roles on Gossip Girl and House. She played Sandy West in The Runaways. In 2013, she was cast as the younger sister of Det. Walter Clark in CBS's crime drama television series, Golden Boy. Maeve had been appearing on Chicago P.D. as Nadia. Her character was killed off on a Law & Order: SVU episode, titled "Daydream Believer", during a crossover event with Chicago P.D. and Chicago Fire. Stella can currently be seen playing the role of Julia Wicker on the Syfy TV series The Magicians.