Britney Spears was only seventeen when she reached the top of the U.S. pop music charts with her 1999 debut album ...Baby One More Time. Now, Spears is ranked as the eighth best-selling female recording artist in the United States according to the Recording Industry Association of America with 32 million certified albums and one of the world's best-selling music artists having sold an estimated 83 million records worldwide. Britney's sixth studio album, Circus, was released in December of 2008 and immediately went platinum. She is currently performing internationally in her The Circus Starring Britney Spears 2009 World Tour.