Yes people, I've gone mad, bad and sadly very, very commercial on this one.
The thing is, I got such a lot of requests to make a lesson for this song, that, when realising it's actually quite a cool tune to learn for both beginners and 'über-pop'-lovers alike ON TOP OF the fact that it demonstrates what wonders a production can do to a relatively simple a piano part (i.e. turn it into something like this).. I decided to give in to your wish.
Hereby!
Have fun.
Cheers, Coen.