Jeanne-Paule Marie "Jeannine" Deckers, better known as Sœur Sourire and often called The Singing Nun in English-speaking countries, was a Belgian singer-songwriter and a member of the Dominican Order in Belgium as Sister Luc Gabriel. She acquired widespread fame in 1963 with the release of the Belgian French song "Dominique", which topped the US Billboard Hot 100 and other charts, along with her debut album. Owing to confusion over the terms of the recording contract, she was reduced to poverty, and also experienced a crisis of faith, leaving the order, though still remaining a Catholic. She died by suicide with her lifelong partner, Annie Pécher.

"Dominique" is a 1963 French language popular song, written and performed by Belgian singer Jeannine Deckers, better known as Sœur Sourire or The Singing Nun. The song is about Saint Dominic, a Spanish-born priest and founder of the Dominican Order, of which she was a member. The English-version lyrics of the song were written by Noël Regney. In addition to French and English, Deckers recorded versions in Dutch, German, Hebrew, Japanese, Korean, and Portuguese.