Holy shitballs, Mom!
(you can stop watching at 8:14)
For the uninitiated, this is the wonderfully talented Michael Bublé. And teenager Sam Holyman. The BBC covered Sam’s singing in this article. And here’s another clip with a little more context from what looks like someone’s camera phone.
Edit: (12/30/2011) The above video was removed for copyvio, so here’s the newer version. They edited it a bit differently; for instance they removed one of the times Michael uses a swear word.