Rihanna Is Billboard’s “Top Pop Artist” Of The Last 20 Years [See Who Else Is On The List]

Riri ousted Beyonce, Brittany Spears, Pink, Mariah Carey, Usher, Janet Jackson and many others as Billboard's Top Pop Artist of the last 20 years. In a series of posts on her Twitter.com page, Rihanna writes, "Billboard crowned me #1 top 40 artist of the decade just 7 years into this!!... HistoRIH (sic)."To her credit, Rihanna [...]