Rihanna performing in Barbados in October of 2005.
Rihanna released her first single, the bubbly dancehall jam "Pon de Replay," when she was just 17. Since then she's put out a remarkable five albums in six years, for combined sales of 7 million. Eighteen of her songs have reached the Top 10; among female performers, only Whitney, Madonna, Janet and Mariah have more. If her latest single, "S&M," tops the charts like it looks it could, it would be her 10th Number One – more than Beyoncé and Lady Gaga combined.