In reply to blue.

She has NOT shipped nor sold anywhere near 50 million albums. Streaming/TEA is what gives her a 50 million album sales claim. Record companies don't even over-ship albums anymore. Because, retail knows albums aren't worth investing in anymore. Universal has NEVER over-shipped a Rihanna album. If they did it would show in her sales/shipments certifications. And, I'm not calling her a cheater but putting a SINGLES artist next to those MONSTER album selling female artist is crazy. It holds no weight whatsoever. No ones, gonna take it seriously. Rihanna has not outsold Mariah or Celine globally. She's simply sold more singles, period. And, that's mostly due to her being in a digital era. Same goes for Katy Perry & Taylor Swift. Those women all have sold over 100 million singles.
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Celine Dion has sold over 250 million albums. Making her 2nd most successful female commercial act in history, behind Madonna. Rih has a 240 million claim (which is amazing), but only 35 million of that are actual album sales in it's purity. The rest are 1.29 singles & streaming/tea points. That's insane to say someone has outsold an artist that's sold over 200 million PURE albums with singles/streams! Celine is the 2nd best selling female, period.