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.
Hack was born in Greenwich, Connecticut. She graduated from Greenwich Academy, Smith College with a BA in History, and an MBA from NYIT. She began her career as a teen fashion model and became the face of Revlon's Charlie perfume from the mid-1970s until the early 1980s. Life proclaimed her one of the million-dollar faces in the beauty industry who were able to negotiate previously unheard of lucrative and exclusive deals with giant cosmetics companies, were instantly recognizable, and whose names became known to the general public. Shelley ranked among a handful of the 1970s supermodels.