... with her performance of Alicia Keys' hit song, "No One":
The New York Daily News reports:
The 25-year-old [Sister Cristina, from Sicily] then told the quartet: "I have a gift and I'm giving it to you."
Fellow Sisters bounce up and down backstage as the judges decide they like what they hear and push their buttons - only to be stunned when seeing the singer.
"If I had found you at Mass I would always be in church," joked one of the panel, an Italian rapper known as J-Ax, who then added: "You and me are like the devil and holy water."
Sister Cristina joined J-Ax's team on the program, saying, "I hope that Pope Francis will call me now."
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