Ok, so here's what I think : I'm willing to bet they are not singing together and this is only a ploy from a fan or something to increase Gaga's ratings,
someone could have just pulled off that video together and it is working like a charm.
If it really were true they would be promoting the hell out of it NOW, they would be milking it for the ratings. So that's what it could be IMO. Bookmark me
Edit: If they do sing together (which is highly unlikely, it will be interesting to watch, especially to see who tries to oversing the other).
