Hilarious! What is it a parody of?

I'm guessing it is a parody, there's too many seemingly random scenes for it not to be.
Like the CMZ crew with Will Arnet and the drinks.

Wasn't Beiber's movie called Keep on Believing or something?
I may have to watch it to improve the viewing pleasure of this movie which I've seen at least 5 times now.
The music is actually really good too. The Bin Laden song is classic!
Plus they start strong with So Humble, with Adam Levine's hologram. Great tune.