Lucy Lane is a fictional character in the DC universe. She is the younger sister of Lois Lane and the most recent person to take on the identity of Superwoman.
In other media
Lucy Lane appears in the 1984 movie Supergirl as a friend and schoolmate of Supergirl's alter-ego Linda Lee. Fame actress Maureen Teefy portrayed her here as a peppy teen-ager with a burgeoning relationship with Jimmy Olsen (mimicking their relationship in the comics).
In Superman: The Movie, she is mentioned (not by name) by Lois Lane right before Superman makes his first public appearance. However, here she's said to have three kids, two cats and a mortgage making it inconsistent with Lucy's later appearance, in the Supergirl movie, where she's still a teenager.