Participants included actress Kate Winslet (who appeared with her yoga teacher as eyes), models Molly Sims and Milla Jovovich, as well from a vast network that started with Blakely's friends and colleagues.
All proceeds from the book go to Every Mother Counts, a nonprofit started by supermodel Christy Turlington Burns to provide funds for maternal health causes in developing countries.
Blakely famously started Spanx with $5,000 of her own savings in the late 1990s, while holding down a day job selling fax machines. She remains the sole owner, with no outside investors, of the shapewear, underwear, and athletic powerhouse.
In 2012, she became the youngest self-made female billionaire.
Earlier this year when Spanx CEO Jan Singer, a former Nike executive, left to run Victoria's Secret, Blakely returned to run the day-to-day operations of her company.
"I operate very much from gut and intuition," said Blakely. "When I first invented Spanx, I'd never taken a business class," and had no experience in fashion design or retailing, and no idea how to raise capital.