ashley tisdale | beyoncé | britney spears | calvin harris | carly rae jepsen | christina aguilera | coldplay | demi lovato ellie goulding | janet jackson | ke$ha | lady gaga | lana del rey | marina & the diamonds | matthew koma | mia martina michelle branch | miley cyrus | nicki minaj | rihanna | rita ora | shania twain | taylor swift | wynter gordon | zedd
With POM, Katy will have 8 #1's. Rihanna has 11. Katy will need 3 more #'1 to tie Rihanna and one more to beat her. And that's given if Rihanna doesn't make it to the top spot on BB100 in the next 2-3 years.