Nicole Kidman and Keith Urban paid a visit to Melbourne Children’s Hospital last week, where they treated patients to a sing-a-long.

The couple was in town for the Swisse Celebrate Life Ball, an annual fundraising event hosted by the Celebrate Life Foundation, and decided to pop in and brighten everyone’s day.

Keith led the way with ‘Amazing Grace’, with Nicole soon joining in on the fun and showing off her impressive vocals.

Kidman recently revealed to the Herald Sun, that her charity work is a crucial part of giving back after a successful career.

"It's one of the most important things I do," the 46-year-old thesp revealed. "I have been doing it since I became well known in the movie industry."

"It's deeply sad," Kidman added, speaking about the young patients in the hospital.

"But events like the Swisse Celebrate Life Ball ensure that we are able to give to families in need. Even if it is just listening and hugging and showing support, then it's worth it."