9. Miuccia Prada

•  Net Worth: $12.4 B                                                                      
•  Source of Wealth: Prada
•  Citizen: Italy
•  Age: 64

Fashion legend Miuccia Prada presided over an expansion of her namesake company in 2012 as the company's stock skyrocketed. Luxe fashion house Prada opened new stores in Abu Dhabi and Kuwait, and now, the company is reportedly seeking a partner to enter India. The Milanese billionaire is the lead designer of her grandfather's luxury goods and clothing company, working in tandem with husband Patrizio Bertelli, who is CEO.