I like the idea
Your visual style and your representation of the jokes (inflating breasts, comparison with what I presume is yourself) is very neat. The lip sync was a bit off but that's somewhat hard to do. My main point of critique would be the noise when you speak. It's rather important to have a clean recording when your main asset for the flash is your commentary.
On another note: I tried listening to his music and just for the heck of it and it's the usual love crap with tons of sweetness dripping of it. Except the guy doesn't even write it himself. For which I have very little respect as you might guess. For me art is something where you at least make an effort to create something. That puts poor Justin to the lowest category in my eyes.
Anyway, to sum it up... You have some fairly good skills and ideas. The mistakes you make are easily avoidable. I'm fond of your style and looking forward to seeing more of your stuff. Cheers.