Katharine Hepburn and Spencer Tracy are shown in character in a scene from the 1952 movie "Pat and Mike." (AP Photo)
Actress Katharine Hepburn is shown in character with Cary Grant in a scene from "Bringing Up Baby" in 1938. (AP Photo)
Sidney Poitier, Katharine Houghton, Katharine Hepburn and Spencer Tracy in the interracial romance film "Guess Who's Coming to Dinner."