Celebrity Aliens

I read about this and finally found an image. Marvel says all those celebs are aliens. I find it hilarious, Stephen Colbert, Obama, Osama, McCain, Hillary Clinton, Paris Hilton, Tom Cruise, Cartman (...?), the Pope.
I can't figure out who everyone is though. I see four superheroes but that still leaves a bunch of people I don't know.
Don't know if you'll think it's hilarious, but I did. Oprah HAS to be an alien. If anyone recognizes someone, tell me!

the white haired guy has a grey cape with a red suite(idk). and theres a simpson(behind paris hilton)