NEW YORK, United States (AFP) — Singer, makeup entrepreneur, lingerie designer and now the first black woman to head a top luxury fashion house — Rihanna has racked up a US$600 million fortune to become the world's richest female musician, Forbes said Tuesday. The 31-year-old — born Robyn Rihanna Fenty in Barbados — has amassed wealth exceeding that of Madonna (US$570 million), Celine Dion (US$450 million) and Beyonce (US$400 million), whose husband Jay-Z was just named the world's first billionaire rap star. Rihanna's ranking puts into fresh perspective one of her signature lyrics — "work, work, work, work, work," which opened her 2016 dancehall smash "Work." Since bursting onto the scene in 2003, she has spun her triumphs in music into entrepreneurial gold, launching her makeup brand Fenty Beauty — co-owned by French luxury giant LVMH — in September 2017 online and with Sephora. The line found success not least thanks to Rihanna's fame both o...