Well we have two facts from this thread
1) Gaga's highest selling album sold about 7 million more than Rihanna's highest
2) Gaga's second highest album outsold Rihanna's second highest by AT LEAST 1 million (with many less hits)
And an prediction
3) Gaga's next album will outsell Rihanna's third highest...with that number being the sales of TTT, Rated R, AGLM, or Unapologetic
![](http://i.minus.com/iblBd0bBYSIyhR.gif)