Lucy Douglas "C. Z." Guest (née Cochrane; February 19, 1920 – November 8, 2003) was an American stage actress, author, columnist, horsewoman, fashion designer, and socialite who achieved a degree of fame as a fashion icon. She was frequently seen wearing elegant designs by designers like Mainbocher. Her unfussy, clean-cut style was seen as typically American, and she was named to the International Best Dressed List Hall of Fame in 1959.