A video of actress Nicole Kidman and her husband, country music star Keith Urban, singing "Amazing Grace" during a hospital visit, has gone viral and fans are raving about the couple singing praise.

The two visited Monash Children's Hospital Neonatal Intensive Care Unit, in the suburbs of Australia, while in town for the Swisse Celebrate Life Ball, on June 13. The Swisse Celebrate Life Ball is an Australian fundraiser for two children's hospitals, according to Deseret News.

Urban and Kidman toured the new neonatal ward visiting kids with cancer, they even brought some gifts with them to give to the children.

The celebrity couple sang "Amazing Grace" in one of the wards for the children and staff who were noticeably appreciative. Fans sang right along with them as they surrounded the two, hundreds gathered to catch a glimpse and meet the couple at the hospital.

Kidman is very open about her love and support for kids' charities. She told Australia's Herald Sun that she often goes to children's hospitals to help raise awareness and to interact with the children.

"It's one of the most important things I do," she said. "I have been doing it since I became well known in the movie industry."

As soon as the video hit, YouTube fans flooded the comment section with messages of support and admiration toward Kidman and Urban.

One viewer said,"Great couple - Great song - for an even GREATER cause!! Nice to see Keith and Nicole are so humble unlike many other stars. Sure don't look like their having any personal problems either!!"

"This song always gives me chills and hearing the folks along with Keith and Nicole sing it makes it even better!?" another commented.

Kidman helped her husband remember the second verse of the song as they worshiped God in the halls of the hospital. One fan urged Kidman to sing more, "Nicole Kidman should have more confidence in her singing. I loved her singing in her movies," the YouTube comment noted.

Watch the clip of Urban and Kidman singing "Amazing Grace" below: