Madonna has been named the biggest-selling female singles artiste in history.The iconic singer has sold over 17.8 million singles since her chart debut with ‘Holiday’ back in January 1984.However, Rihanna is quickly catching up with the legendary performer after shifting 11.4 million singles in just seven years, reports The Official Charts Company.Kylie Minogue is at number three with 10.2 million singles sold across her 25-year career, while late Whitney Houston is at four (8.5m) and Lady GaGa is at five (7.329m). BBC