From Wikipedia Career achievements Having thirty-one million RIAA-certified albums sold in the U.S., Spears ranks as the eighth best-selling female artist in American music history.[10] Only female artist in SoundScan history to have her first three albums debut at number one. Then she broke her own record for a female artist by having her first four albums debut at number one on the Billboard 200 chart. In the U.S., Spears, Madonna, Céline Dion, Mariah Carey, Whitney Houston, Shania Twain and the Dixie Chicks are the only female artists with multiple diamond (shipped over ten million copies) albums (Spears has two: '...Baby One More Time and Oops!... I Did It Again). Holds the record for youngest artist (at age seventeen) to have his or her first single ("...Baby One More Time") and first album (...Baby One More Time) simultaneously reach number one on the Billboard charts. Holds the record in the UK for biggest first-week sales for a greatest hits compilation by a female artist (115,341 copies) with Greatest Hits: My Prerogative. "...Baby One More Time" was the UK's biggest selling single of 1999. Has grossed over $145 million USD from tour ticket sales. Has grossed over $30 million USD in merchandise from her tours. Has topped Yahoo!'s annual list of the most-searched names three times in the past four years.[11]