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Daughter of Meryl Streep and Don Gummer. Sister of Henry Gummer. Niece of Harry Streep and Maeve Kinkead. Nominated for the 2007 Lucille Lortel Award for Best Featured Actress for her performance in "The Water's Edge.". Won a Theatre World Award in 2006 for her performance in "Mr. Marmalade". Played the same character, at a younger age, as her real-life mother, Meryl Streep, in the film Evening. Appeared as a Starbucks barista in a scene cut from 'The Devil Wears Prada' that is included in the deleted scenes on the DVD. Her mother, Meryl Streep, was pregnant with Mamie when she accepted her Best Actress Oscar for Sophie's Choice in 1983. Cast as Cecile in the 2008 Broadway production of Christopher Hampton's play "Les Liaisons Dangereuses." This is the play on which the movie Dangerous Liaisons, starring Glenn Close, was based; Close played Gummer's mother in Evening. Mamie is a 2005 graduate of Northwestern University's School of Communications.