SPANX Founder Sara Blakely on Joining 'Shark Tank': 'I Was Flooded

ET got a behind-the-scenes sneak peek at Blakely's guest-starring role.   

Sara Blakely

Sara Blakely - Wikipedia

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Sara Blakely's First EVER Shark Tank Deal, Shark Tank Firsts

Sara Blakely's First EVER Shark Tank Deal, Shark Tank Firsts

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Sara Blakely

SPANX Founder Sara Blakely on Joining 'Shark Tank': 'I Was Flooded With Emotion' (Exclusive)

Sara Blakely