Could it be that the same man who is famous for biting the head off a live bat also washes his hair with Evian? Apparently so, and we've got the picture to prove it. We don't think it's all that likely that Ozzy Osbourne accepted money to advertise the product, so we'll give him the benefit of the doubt and presume that he was hot after coming off stage, and the bottle was the closest thing to him that could solve the problem.
The picture comes from a grand event - the first ever Live Aid in Pennsylvania in 1985 - and Osbourne certainly dressed for the occasion, in a flamboyant robe. Given the outfit, and the scale of the occasion, we can probably forgive him for getting a little hot under the collar and needing to cool off.