I've seen a few versions of Beyonce's Single Ladies in my time. This gets a special nod because of the number of people, folksy venue, and distracting lack of pants. Oh and there's a really cute proposal at the end.
Good to know that although Justin Bieber has apparently grown a few inches and gained a few pounds since meeting the girl of this dreams (NOT Selena Gomez?!), he hasn't lost his cherubic voice or poppin' fresh moves.