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All you have to do is tell/convince them that it would make them more famous than they already are. In other words, tell them that they will inspire and motivate people to use, wear, or eat the product; that will give people a better life style and they will look up to the celebrities who promote it.
Makeup for celebrities is in many ways same as for normal common people. But if I want to stimulate celebrities to use my product I will approach to them with that product on myself. I will show to them that product is very pigmented, long lasting and from natural ingredients. I will guarantee good visibility on tv and photography.