Nicole Kidman and Keith Urban sung to sick children at a hospital in Melbourne yesterday (13.06.14).

The couple performed an emotional version of 'Amazing Grace' in front of patients, their families and members of staff at the Monash Children's Hospital in Australia.

The 46-year-old singer pulled out his guitar and began playing the tune, while his wife, 46, belted out the lyrics as members of the audience recorded the duet on their mobile phones and cameras, according to the MailOnline.

This isn't the first time the pair - who married in 2006 and have children Sunday, five, and Faith, three - have performed together as they also took to the stage in 2010 at the G'Day USA ball to sing Men At Work's 'Down Under'.

Meanwhile, the 'Grace of Monaco' actress recently admitted that she's at her happiest when she's with her family because she knows time with them is ''precious''.

She said previously: ''At this stage of my life, and with time being so precious, the joy I get from us as a family outweighs any joy in any other area of my life, by far.''

Nicole - who has also Isabella, 21, and Connor, 19, with her ex-husband Tom Cruise - also insisted she wouldn't hesitate to give up work if it would improve family life.

She explained: ''If it were the choice between my family and Keith, and my career, I wouldn't even bat an eyelid.

''The most important things to me are the love of our relationship and my children.''