Change of Habit

Change of Habit is a 1969 American musical drama film directed by William A. Graham and starring Elvis Presley and Mary Tyler Moore. Written by James Lee, S.S. Schweitzer, and Eric Bercovici, based on a story by John Joseph and Richard Morris, the film is about three Catholic nuns, preparing for their final vows, who are sent to a rough inner city neighborhood dressed as lay missionaries to work at a clinic run by a young doctor. Their lives become complicated by the realities they face in the inner city, and by the doctor who falls in love with one of the nuns.

Dr. John Carpenter is a physician in a ghetto clinic who falls for a coworker, Michelle Gallagher, unaware that she is a nun.Elvis stars as a professional man for the first time in his career. Dr. Carpenter heads a clinic serving an underprivileged community in a major metropolis. He is surprised to be offered assistance by three women. Unknown to him, the three are nuns in street clothing who want to aid the community but are afraid the local residents might be reluctant to seek help if their true identities were known. The nuns are also facing opposition from the ungodly priest from the local parish. ........

Source: Wikipedia