She met her third husband, actor Jeff Conaway, at an Allan Carr party during the filming of Grease (1978), which co-starred Jeff and her sister Olivia Newton-John. She was 35 and he 28 at the time. They married two years later in 1980 but divorced within a few years.
Son Emerson Newton-John (born 1974) is a professional race car driver who has raced in Europe, Australia, and the United States.
After her death, she was cremated and her ashes were scattered at Cape Byron, NSW, Australia (her famed sister, Olivia later confirmed this in an interview).