Gaga
#13 Til It Happens To You
None of her other videos are in the top 300
Katy
#25 Roar
#27 Dark Horse
#102 Last Friday Night
#117 This Is How We Do
#122 Firework
#160 Wide Awake
#161 Hot N Cold
#195 Part of Me
#299 California Gurls
Rihanna
#124 Diamonds
#134 FourFiveSeconds
#136 Can't Remember To Forget You
#146 We Found Love
#163 Stay
#223 Bitch Better Have My Money
#267 Only Girl (In The World)
#289 What's My Name
Based on this (the actual viewer data that shows which videos the GP remembers enough to watch): Katy > Rihanna > GaGa
Wow! I guess it's settled then! Katy > Rihanna >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> GaGa! 
