WARNING: THE LANGUAGE MAY BE OFFENSIVE!
This video was obtained by TMZ years ago, but they say they didn't post it because at the time JB was only 15 and he apparently apologized just after telling the racist joke. It looks like it was shot while the young Bieber was doing some promo type stuff and he obviously knew that the video camera was rolling. It's a pretty disgusting joke and I think that what makes it worse is that there is an adult woman who follows up the joke with one of her own.
TMZ reports that Justin is pretty bummed by the whole situation. Sources close to Bieber say he is "frustrated and sad" and now wants to address it publicly, which should be any day now.