The eldest daughter of Meryl Streep exchanged "I dos" with Walker, 29, Saturday at the family estate in Connecticut. Gummer wore her grandmother's gown at the lake-side ceremony, attended by 150 guests including her Evening co-star Claire Danes, Laura Linney and Tracey Ullman.
Gummer, 27, recently starred in the short-lived medical drama Off the Map and has made several appearances on The Good Wife as attorney Nancy Crozier. Walker headlined the Broadway musical Bloody Bloody Andrew Jackson and will next star as another past president in the film adaptation of Abraham Lincoln, Vampire Hunter.
The two became engaged in 2009.