What? I didnt say that at all and even posted Rihanna having more AFTER the list with Gaga.
Using the numbers you just posted -
Rihanna has sold 80 Million over 7 Years and 6 Albums.
Beyonce has sold 75 Million over 9 Years and 4 Albums, if its not counting DC.
Shakira has sold 70 Million over 15 Years and 7 Albums.
Gaga has sold 64 Million over 4 Years and 3 Albums.
Simple numbers speak for themselves.