She had 3 number ones in 2010 (California Gurls, Teenage Dream, Firework) and 3 number ones in 2011 (Firework, ET, Last Friday Night)
All of them as a lead artist...such as all the artists in the list above except for Rihanna...she had 3 singles as a lead artist in 2010...and 1 collabo as the featured artist...
Queen Rih had 3 #1's in 2008 too. Stay bitter though.