Sister Act.

When a worldly singer witnesses a mob crime, the police hide her as a nun in a traditional convent where she has trouble fitting in.

sister act 2: Back in the habit

Deloris Van Cartier (Whoopi Goldberg) is again asked to don the nun's habit to help a run-down Catholic school, presided over by Mother Superior (Maggie Smith). And if trying to reach out to a class full of uninterested students wasn't bad enough, the sisters discover that the school is due to be closed by the unscrupulous local authority chief Mr. Crisp (James Coburn).