Naomi Campbell is spotted exercising on holiday after decadent birthday celebrations

One would imagine the life of a supermodel is full of perks - free clothes, top stylists and access to the best the beauty industry has to offer.But if your work requires you to look good, holidays don't mean you can just lie back and enjoy the good weather - as Naomi Campbell proved. Running buddies: Naomi Campbell and Vladimir Donin were spotted pounding the streets