Shelley Marie Hack (born July 6, 1947) is an American model, actress, producer, and political and media advisor. Hack is best remembered as the face of Revlon's Charlie perfume from the mid-1970s until the early 1980s, and for her role as Tiffany Welles in Season 4 (1979–1980) of the ABC television drama Charlie's Angels, replacing the departing Kate Jackson. She appeared in a total of 26 episodes of the series, before being replaced in Season 5 by model-actress Tanya Roberts.