Robyn “Rihanna” Fenty is officially a billionaire, according to Forbes. The magazine estimated that the 33 year old pop star’s net worth is 1.7 billion dollar, thanks to her music career, her makeup brand and her lingerie line. The designation makes her the wealthiest female musician and the second-richest woman in entertainment behind Oprah Winfrey.Forbes estimates Fenty Beauty alone is worth 2.8 billion dollar.