One celebrity that I've had very little use for over the years is Sean Combs, aka Sean John, aka Puff Daddy, aka P. Diddy. I always thought of him as a no-talent poseur, and I never really understood why he was famous--his average looks? His sucky music? His overpriced clothes? His bad relationships with women? He just seemed to exert some kind of weird influence over people that I couldn't understand. In addition to his general popularity, he's also very popular with celebrities. I remember thinking, "Maybe he just throws really good parties??"
So I am surprised to report that Sean Combs is possibly the funniest actor in this very funny movie! He has a fairly big part too--it's much more than just a cameo.
Russell Brand and Jonah Hill are both very funny too. Despite the fact that Russell Brand's character is a self-centered, self-destructive, manipulative junkie, he also radiates a sweet childlike charm that makes you root for him anyway. Jonah Hill plays the only sane person in an increasingly insane situation. And Sean Combs plays a megalomaniacal record company executive who is the worst boss ever. It's worth seeing in the theater if you get a chance.