The pop star is worth $1.7 billion (£1.2 billion), with an estimated $1.4 billion coming from the value of her Fenty Beauty cosmetics company.
The rest of her fortune mostly comes from lingerie company, Savage x Fenty, worth an estimated $270 million, and her earnings from music and acting.
She is second only to Oprah Winfrey as the world's richest female entertainer.
Rihanna - whose real name is Robyn Fenty - launched Fenty Beauty in 2017 in a partnership with luxury goods company LVMH.