Her finale competitor tried his luck singing 'Stairway To Heaven', but there was no getting past Sister Cristina Scuccia's habit and crucifix.
Suor Cristina was quick to thank God for her victory and recited an 'Our Father' prayer.
"I want Jesus to come in here!" said the 25-year-old, who was dressed in the black shoes and ankle-length black skirt she has worn throughout the competition.
"My presence here is not up to me, it's thanks to the man upstairs!" said Suor Cristina after winning out against a 28-year-old long-haired hard rocker.
Suor Cristina has won a record contract with Universal but has hinted she doesn't want a musical career.
"I'm not here to start a career, but because I want to impart a message," she said, adding that she was following Pope Francis's calls for a Catholic Church that is closer to ordinary people.
The humble nun shot to fame in recent months, with her audition performance of Alicia Keys's 'No One in March' getting more than 50 million views on YouTube.
The habit has it: singing nun wins The Voice of Italy 2014 (AAP)
Suor Cristina has already sung alongside Kylie Minogue and has also received an endorsement from actress Whoopi Goldberg - the star of the 1990s comedy 'Sister Act' where she is a singer playing a nun.
But Suor Cristina still defined herself as a "humble servant" and ascribed her sudden success to a "thirst for joy" among television viewers.
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