Before she made the Forbes World's Billionaires List, Sara Blakely -- who started her Spanx business with $5,000 -- talked with "Extra" about her inspiration.

"I cut the feet out of my control top pantyhose to wear under these white pants and that was the ah-ha moment that started Spanx," Blakely said. She added, laughing, "My own butt was my own inspiration!"

Watch the interview!

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