Demi Moore's bum made news

The always prepared Ashton Kutcher has decided to do something really special, so he posted an image of someone's butt on his Twitter page. Now, it most PROBABLY belongs to his wife, Demi Moore; in fact, it's definitely her bum (not that we checked).

So, what's so interesting about this trashy news? You see, the sources disagree on whether Demi wears a white bikini or, you'll guess- good ol' white underwear even your grandma is embarrassed to wear these days.