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ET got a behind-the-scenes sneak peek at Blakely's guest-starring role.
Sara Blakely - Wikipedia
Spanx founder in talks to guest star on 'Shark Tank
Masters of Scale: How to find your big idea, with Sara Blakely
Watch: Spanx Employees React to Gift of $10,000, Plane Tickets
Meet Sara Blakely, Shark Tank US
Spanx founder: My dad encouraged me to fail
Sara Blakely: My inspiration was my own butt
Shark Tank entrepreneur gets a hand from Spanx founder Sara Blakely
Sara Blakely