Again, another hard one! However, think it's got to be eith Baby (Justin Beiber) or Boyfriend (Justin Beiber). I don't hate him like so many people do, and well done to him because he has done pretty well, but his songs kind of annoy me, no offence to any Beiber fans!!'When I was thirteen/I had my first love'? Yeah. Right. Not to mention the aggravating 'Baby Baby Baby Oh!'.
Baby: http://www.youtube.com/watch?v=vLJ9fHqDlOA
Boyfriend: http://www.youtube.com/watch?v=4GuqB1BQVr4