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

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

Sara Blakely

Sara Blakely's First EVER Shark Tank Deal

Sara Blakely

Sara Blakely

Sara Blakely, Biography, Spanx, & Facts

Sara Blakely's First EVER Shark Tank Deal

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Shark Tank Guest Sara Blakely of Spanx Wears Dress Backwards