(Born Dec. 15, 1963) Helen Slater is an American film actress and singer-songwriter. In 1984, she was cast as the title character, versus Faye Dunaway as Selena, in the film Supergirl, released in 1984. In her next film, she was cast alongside Christian Slater and Yeardley Smith as Billie Jean Davy, a modern day Joan of Arc, in the cult classic The Legend of Billie Jean (1985). Next she appeared in two high profile comedies, Ruthless People (1986) and The Secret of My Succe$s (1987), playing ingenues in both roles.