Nicole Kidman and Keith Urban sing at a children's hospital

I dare you to watch this without smiling.

Over the weekend, actress Nicole Kidman and her husband singer Keith Urban visited a children's hospital in Australia. Not only did they sing for the patients, the couple also donated an autographed guitar for the hospital's charity ball.

The best part? Kidman and Urban were not the center of attention, as the hospital staff also joined in the endearing rendition of "Amazing Grace."