Eminem is the worlds greatest WHAT now?

I was watching T4 this morning and was offered a whole hour of Peter Andre trying to convince me that Eminem is the greatest popstar in the world.
1. The worlds greatest popstar? Pop? Is that really how you would categorise what Eminem does?
2. Considering Peter Andre's recent success in the music business he is not exactly the guy I would listen to for music advise

3. Peter Andre: Seriously? You pick Eminem over the likes of Michael Jackson and Madonna? Did you go through the lobotomy before or after you divorced Katie Price?