Pop star Rihanna’s net worth is estimated at $1.7 billion, making her the richest woman musician in the world, but her music is not the primary source of her wealth, Forbes magazine said. The Barbados-born singer, whose birth name is Robyn Fenty, derives an estimated $1.4 billion of her fortune from her 50 per cent stake in the Fenty Beauty cosmetics line, Forbes reported. The rest of Rihanna’s wealth comes from her share of the Savage x Fenty lingerie company and her income as a singer and actress, the magazine said.