drinking, using, piss?

I read on here aaaages ago that supermodels drank their own piss for some reason. And I read somewhere else not so long ago that it could be used as a good treatment for the skin in some way. So I was just a bit curious as to what it does and stuff...?
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Drink their own piss? Urgh, cant think of any benefits of that considering its just waste product.
Yeah, I think you watch "Friends" a bit too much - "The one with the jellyfish" <IMG alt="image" alt="image" SRC="http://www.thesite.org/ubb/wink.gif">.
But yeah, it's a waste product, so why?