Meryl Streep's daughter Mamie Gummer, is headed to The Great White Way. She was overheard at The Plumm telling a pal that her play "The Autumn Garden," which she starred in over the summer in Williamstown, is coming to Broadway and she'll be in it. Gummer was at the club with her boyfriend of three months, Eric Murdoch, who was also in the play and will join her on Broadway. The two were drinking, dancing and cuddling all night.