Spanx founder in talks to guest star on 'Shark Tank

Blakely — the world’s youngest self-made female billionaire — sold fax machines door-to-door before hatching the idea for Spanx, when she cut the feet off a pair of pantyhose.

Guest 'Shark' and Spanx Founder Sara Blakely Says This Question Helped Her Become a Success

Sara Blakely: My inspiration was my own butt

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How failure helped Spanx founder Sara Blakely reach billionaire status