Eva Longoria & Perfect Slim

So L'Oreal used Eva Longoria to appear in their Perfect Slim Advert. Young women all over the world would kill to look like her and this advert is basically saying "buy this product and you will look like this." Do you really think Eva uses this? Even though its a bestseller are customers actually really satisfied? Do they trust L'Oreal? Or isit the language and image of these role models that consumers trust?