Net worth: $1 billion
Sara Blakely, the inventor of Spanx, took her life’s savings of $5,000 at age 29 and built a billion-dollar powerhouse undergarment company. In doing so, Blakely, 41, became the youngest female self-made billionaire in the world. Blakely, who now has one child, still owns 100 percent of the undergarment company, and is considered a hero to women and tight-fitting dresses everywhere.
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