In reply to Jeans.

Mariah has sold more than Whitney. At least until Whitney´s death (there was a boost after her death obviously). If Whitney hadn´t taken the drugs route maybe she would have sold more since she was the bish that used to sell more per album. But Mariah has worked longer and harder and has sold more. Not more than Celine though. Whitney is 4th. Mariah is probably 3rd. All of them are monumental so it is irrelevant.
Rihanna??? LMAO yeah like digital singles can compare.