Doris Singleton
Doris Singleton was an American actress, perhaps best remembered as Lucy Ricardos nemesis or frenemy, the snobbish Carolyn Appleby, in I Love Lucy.
Singleton, born in New York City, trained as a classical ballerina, dancing for three seasons in the mid1930s with the newly formed Ballet Theatre, later to become the American Ballet Theatre. She began her career in show business as a vocalist in the late 1930s with Art Jarretts orchestra. Her distinctive low, lyrical voice made her a favorite in the radio industry. Doris Singleton worked in New York during World War II both as a guest star and in regular roles on numerous hit radio shows, including The Whistler and The Alan Young Show.
Source: Wikipedia