Don’t you love it when celebrities are out there doing random acts of kindness?

Such is the case with “American Idol” judge and country superstar Keith Urban and his wife, actress Nicole Kidman. The API reports that the above video is from over this past weekend when the couple stopped by the Monash Children’s Hospital in Mebourne, in their native country of Australia, to visit patients and then give an impromptu performance of “Amazing Grace.”

Who knew Nicole Kidman had such a pretty voice?

The API further reports that the last time the two sang together in public was at the 2010 G’Day USA gala, where the couple performed “Down Under” by Australian band Men at Work. Urban is expected to return for “American Idol” Season 14 and we say — duet with Nicole!