Kylie Jenner — Kylie Cosmetics

Kylie Jenner’s Kylie Cosmetics achieved explosive market dominance, with lip kits selling out in 30 seconds and crashing the website at launch. The brand generated $360 million in revenue in its first 18 months with just seven employees, a per-employee output of $51 million that outperforms #6 The Rock’s Teremana Tequila’s per-employee efficiency of $30 million. Jenner sold 51% to Coty for $600 million in 2020, netting a $900 million beauty exit before her 23rd birthday. Although her family background provided a head start, the business execution turned Instagram followers into a billion-dollar valuation—33% faster than the average direct-to-consumer brand—proving her side hustle eclipses typical celebrity ventures in speed and scale.