We all love Lucy as a redhead, but the fact of the matter is she was born a brunette. First, she dyed it blonde, then bright red to stand out against other actresses. Needless to say, it was a good a move that suited her firecracker personality.
Born Norma Jean Mortenson (and a brunette), she changed her name to Marilyn Monroe and went to Hollywood's Frank and Joseph Salon in 1946 to became a golden blonde. Later, inspired by '30s film star Jean Harlow, she decided to go full-on platinum. Fun fact: she "liked to feel blonde over," which meant, yep—she dyed her pubic hair.