Stella Maeve Johnston is an American film and television actress. 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, a drama film about the 1970s all-girl rock band of the same name, alongside Kristen Stewart and Dakota Fanning.
In 2013, she was cast as the younger sister of Det. Walter Clark in CBS's crime drama television series, Golden Boy.