Now she has helped make such luxuries even more attainable—if a trifle smaller. In 2010, she and business partner Hayley Barna founded Birchbox, an e-commerce startup that sends monthly cosmetics samples to subscribers, who then have the option to purchase full-size products. The idea, formed during their days at Harvard Business School, quickly caught on, receiving $11.9 million in venture-capital funding. By her seventh month in business, Ms. Beauchamp had already exceeded her five-year sales goal.

Read Now