Who is world's best popstar? Details (Optional)

My friend thinks McFly, but me, I got no clue XD
And Taylor Swift is good, I just dunno who's best XD

Well since it's a pop star, Taylor Swift! She's country pop.

1D Rocks, JB is simply cool ,taylor swiftis nice and katy perry is awesome but MJ is king of pop star. Nobody can take his placeB)