The Material Boy.

An Italo-American teenaged girl in Michigan, with a Catholic family, becomes pregnant. To avoid both a scandal and an abortion, she secretly gives birth to a boy in hospital, which is run by nuns. They establish a false identity for him and arrange to have him brought up in Argentina. At the age of 18, the boy discovers that his biological mother is Madonna Ciccone, who, after giving him up, became the iconic international pop-culture mega-star.