The youngest self-made billionaire woman in the U.S. didn't grow up in a Manhattan high rise or the Hollywood Hills. Instead, Rihanna amassed her fortune from her own music and entrepreneurial ventures.

Recently, the 34-year-old singer and Fenty Beauty CEO graced Forbes' annual list of America's richest self-made women for the third year in a row. She ranked 21st overall, and is the list's only billionaire under age 40. Some of Rihanna's $1.4 billion net worth is from her successful music career. Most of it is from her three retail companies: Fenty Beauty, Fenty Skin and Savage X Fenty.