American businesswoman, Sara Blakely has an estimated net worth of $1 billion in June 2016, according to Forbes list. Blakely founded Spanx, a multi-million dollar undergarment company. She is the world's youngest self-made female billionaire. She was 29 when she invested her entire life savings, $5,000, trying to come up with something flattering to wear under her white slacks. Six months later, the one-time Disney World ride greeter and door-to-door fax machine salesperson found her new line of shaping underwear, Spanx, named one of Oprah Winfrey's Favorite Things. Since then, Blakely has taken Spanx from a one-product wonder sold out of her Atlanta apartment to a billion-dollar powerhouse with just under $250 million in annual revenues and net profit margins estimated at 20%. She owns 100% of the private company, has never advertised and never taken outside investment.

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