Rihanna takes No. 3 for Billboard’s 25 Greatest Pop Stars of the 21st Century, and we’re breaking down why the pop diva has earned her rank with her Hot 100 No.1s, Billboard Music Awards and more! Which Rihanna song is your favorite? Let us know in the comments! ►► Subscribe for more music news: http://blbrd.cm/Proracf ►► See our latest videos: http://blbrd.cm/xOgw6VQ About: Billboard is the world's most influential music media brand, with an unmatched authority among artists, fans and the

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