Young Success: In America, Rihanna is the youngest self-made billionaire woman with a net worth of $1.4 billion.

The youngest woman in the United States to become a self-made millionaire didn't grow up in a Manhattan skyscraper or in the Hollywood Hills. Rihanna instead built her wealth through her own music and business endeavors.

The 34-year-old singer and CEO of Fenty Beauty just reached Forbes' list of America's wealthiest self-made women for the third consecutive year. She came in at number 21 overall and is the only billionaire under 40 on the list. Rihanna has a $1.4 billion net worth, some of which comes from her lucrative music career. Her three retail businesses, Fenty Beauty, Fenty Skin, and Savage X Fenty, account for the most of it.