Spanx founder Sara Blakely attends the Massachusetts Conference for News Photo - Getty Images

Spanx founder Sara Blakely attends the Massachusetts Conference for Women at Boston Convention & Exhibition Center on December 8, 2016 in Boston, Massachusetts. Get premium, high resolution news photos at Getty Images

1,101 Sara Blakley Photos & High Res Pictures - Getty Images

1,101 Sarah Blakely Photos & High Res Pictures - Getty Images

Billionaire Spanx founder Sara Blakely shares her best business advice

Spanx founder Sara Blakely attends the Massachusetts Conference

Spanx founder Sara Blakely at Synapse Summit in Tampa - Tampa Bay

Sara blakely spanx hi-res stock photography and images - Alamy

67 Woman Spanx Stock Photos, High-Res Pictures, and Images - Getty

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Sara Ma Photos and Premium High Res Pictures - Getty Images

Photos: Spanx founder Sara Blakely through the years