Katharine Houghton (born Katharine Houghton Grant; March 10, 1945) is an American actress and playwright. She portrayed Joanna "Joey" Drayton, a white American woman who brings home her black American fianc to meet her parents, in the 1967 film Guess Who's Coming to Dinner. Katharine Hepburn, who played the mother of Houghton's character in the film was, in real life, Houghton's aunt.