3. Aerin Lauder

Aerin Lauder is the granddaughter of Estee and Jospeh Lauder, the co-founders of the cosmetics mogul Estee Lauder. The 47-year old is currently estimated to be worth $1.85 billion. She is the style and image director for the Estee Lauder companies, and has also founded her own brand called AERIN which sells fashion, cosmetics, and home furnishings.