She was previously named Billboard's greatest pop star of the year in 2003 and 2014 ... one of the world's best-selling girl ...

Geri Halliwell-Horner looks back at her time as a Spice Girl and talks about her transition to becoming an author.

As Billboard kicks off its 2005 week, this Vintage Pop Stardom episode of the Greatest Pop Stars podcast looks at Ciara -- the kind of pop star we don't often see anymore -- at her early peak.

From the sublime, simple comedy of The Beatles' A Hard Day's Night to the enthusiastic chaos of The Spice Girls ... pop star portrayals in movies and on television. One of the greatest pop ...