Brazilian beauty Gisele Bundchen is on course to become the world's first billionaire supermodel, according to business magazine Forbes.The pin-up has been the highest-paid supermodel since 2004 - and thanks to her savvy financial sense, she could be a billionaire by the time she turns 32 next summer.Forbes editors list her lucrative Versace and Dior contracts, her successful jewellery and footwear lines and her real-estate holdings in Brazil, Costa Rica and Brentwood, California among her assets.The publication reports Bundchen will not only become the first billionaire supermodel, but also the first Brazilian female self-made billionaire.