This is one of the sweetest videos we have seen in a long time!

Keith Urban and Nicole Kidman visited the Monash Children's Hospital in Melbourne, Australia last Friday, where they serenaded patients with a beautiful version of "Amazing Grace."

While the country singer sang and played the guitar, his wife sang along as well ... and sounded amazing. We almost forgot the "Moulin Rouge" star had such a sweet voice!

They also turned heads at a charity event in Melbourne last week, where Nicole showed off a whole lotta cleavage on the red carpet in an uncharacteristically sexy gown. Keith will also be performing in Brisbane on Tuesday for the next stop of his "Light the Fuse Tour."

And while Keith is sticking around Australia for a little bit, Nicole is already in Shanghai -- where she promoted her latest film, "Grace of Monaco," at the Shanghai International Film Festival over the weekend.

These two are always on the move, which makes it even sweeter to see them harmonizing together in the video above!

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