Mary Willa "Mamie" Gummer (born August 3, 1983) is an American actress.
Mamie Gummer was born on August 3, 1983 to actress Meryl Streep, and sculptor Don Gummer. She grew up in Los Angeles, California and Connecticut with her older brother, Henry and younger sisters, Grace Gummer (also an actress) and Louisa.
http://en.wikipedia.org/wiki/Mamie_Gummer

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