In Believe IT, Jamie Kern Lima, founder of IT Cosmetics, shares the wild but true story of how a once struggling waitress turned her against-the-grain idea into an international bestselling sensation, eventually selling the company for over a billion dollars and becoming the first female CEO of a brand in L'Or?ʼal's 100+ year history. Faced with self-doubt, body-doubt, God-doubt, down to her last few dollars and told "No one is going to buy makeup from someone who has your body," Jamie reveals for the first time what really went down, how she almost didn't make it, how she learned to trust herself, and the powerful lessons you, too, can use to go from underestimated to unstoppable.