We've long subscribed to the theory that celebs are muckier pups when it comes to personal hygiene than the rest of the world. Julia Roberts and her hairy monster pits. Fergie from Black Eyed Peas and her sweaty front bum. Pete Doherty and his soapless bathtime. And now add Charlize Theron to the mix!

The stunning actress has told David Letterman she's not afraid of humming of BO and can quite happily skip showers for a whole week or more if needs be. "I'm a tough girl and I can not shower for a week - I'm fine with that. There's a time and a place for everything and sometimes there's a time for not showering" she said. However she will not under any circumstances sleep on dirty sheets.

Charlize also told how she enjoys taking time out of her 5 star lifestyle to rough it in the wilderness, taking regular camping trips and playing at being a real life hobo. Check out Letterman working his charms on Charlize. Not a chance.