An engineering student becomes bored with his wealthy fiancee, and breaks off the engagement with her when he falls for a mysterious teenager (Ringwald) he meets at a houseparty out in the country. His friends think he's crazy and try to discourage his pursuit of a romance with an uneducated, lower class girl. Ultimately, he realizes that they are not meant to be together.—mistermycroft
Molly Ringwald, Andrew McCarthy, Patti D'Arbanville
IMDB plot
A college student from Cincinnati breaks off his engagement to his wealthy fiancée after falling in love with a girl from Kentucky. She claims to be 20, but he learns she is actually only 16 and already married.