NO IT'S NOT Robert and Kristen!
And saying "NO it's not them" doesn't seem to solve the problem. Same thing with "Robert Pattinson doesn't have a twitter". If you want to believe you REALLY are talking to Rob on twitter a part of the brain malfunctions and stops listening to reason. You end up believing a "mailman" is Robert Pattinson :)
The .gif is from a montage of best movie kisses of all time. It's not a deleted scene or blooper from New Moon nor is it anyone getting "caught" smooching.