It is probably actually Tom Cruise!
And that construction is so odd. "The most famous living person in the history of the world" means he is the most famous person currently living? More famous than than any other person in history during his lifetime? Like, Jesus is maybe the most famous person ever (or Abraham or something), but Obama has the edge because he didn't become superfamous thousands of years after his death? What about Napoleon? Or is it because there are just more people in the world now, thus making Obama more known to more people?
And hey, what about George W. Bush? The entire world just spent eight years hating him! He represented our entire nation, and we are the most famous nation on Earth! People have been cursing Bush's name and hanging him in effigy across the globe, and honestly they only just got to know this Obama character. Surely news hasn't yet reached some far-off places where the name Bush still gets a laugh.
No, sorry, Dee Dee, we know you have a magazine to sell, but we're not buying it. The most famous living person in the history of the world is George W. Bush, which is why we are in this mess.