Yesterday, Forbes revealed that JAY-Z is worth a billion dollars, the first in the Hip Hop genre to achieve the milestone. 

Today, the money mag says that Rihanna is nipping at his heels with a $600 million fortune. 

Famous first as a singer, Robyn Rihanna Fenty, age 31, has since evolved into a style icon and makeup entrepreneur—and soon she’ll be the first black woman in charge of a major luxury fashion house. All those efforts add up to a $600 million fortune, making her the wealthiest female musician in the world, ahead of the likes of Madonna ($570 million), Céline Dion ($450 million) and Beyoncé ($400 million).

Like Hov, most of Rihanna's net worth comes from outside of the music world. 

Rihanna owns 15 percent of her personal care brand Fenty Beauty, with the rest owned by French fashion giant LVMH.

Forbes estimates Fenty Beuty is worth $3 billion. That would put Rihanna's share at $450 million, or 75 percent of her net worth.