Greta Simone Kline (born March 21, 1994), also known by the stage name Frankie Cosmos, is an American musician and singer-songwriter. She is known for her independent releases, inspired by Frank O'Hara's poetry, DIY ethics of K Records and the early 2000s New York City's anti-folk scene. She is the daughter of actors Kevin Kline and Phoebe Cates. Her former stage name "Frankie Cosmos" is now the name of her band.