Great Balls of Fire

Warning: Wikipedia contains spoilers.

Great Balls of Fire is a 1989 movie starring Dennis Quaid and Winona Ryder.

The movie details part of the life of rock and roll singer Jerry Lee Lewis. It shows the part of his life where he became a teen idol, to the point where many thought he would supplant Elvis Presley as the king of rock and roll. It also shows episodes of the singer's life where he had to battle alcohol addiction, and where he romanced his 13 year old cousin. The movie takes viewers through a part where Lewis and his underaged cousin went to Georgia and married secretly, then had her father make threats against him, and the general public turn their backs on the singer once a British reporter discovered he was married to his teenaged cousin, upon the couple's arrival in London.

The movie ends after Lewis learns he is about to become a father, as his wife and cousin tells him she has become pregnant.