Meryl Streep\'s daughter, actress Mamie Gummer, and her husband of less than two years, actor Ben Walker, have split up, Gummer\'s publicist said. Gummer\'s representative confirmed the break-up to People, the magazine reported Saturday. Gummer, 29, and Walker, 30, met in 2008 while they were both performing in the Broadway play \"Dangerous Liaisons.\" They got engaged in October 2009 and tied the knot in July 2011 at Gummer\'s family estate in Connecticut.