She grew up in Salisbury, Connecticut and in Los Angeles, California.
She has one older brother named Henry Wolfe Gummer and younger sisters Grace Gummer, an actress and Louisa Gummer, a model.
Born in the urban world of United States, New York City, Mamie Gummer is an American citizen by birth.
Her mother is an actress named Meryl Streep and her father is sculptor Don Gummer.
In 2016, he starred as Patrick Bateman in the Broadway musical adaptation of the film American Psycho.
" Gummer said of Walker, her date at Monday's gala.on Tuesday night (June 20) at the Landmark Sunshine Theater in New York City.