NME reports that Rihanna beat out a slew of artists including Britney Spears and Taylor Swift, who rounded out the top three.
Results in the UK were slightly different, with Taylor topping the list, followed by Rihanna and your friend and ours Florence Welch.
Both lists can be found below if you've got a moment.
Carly Rae Jepsen
Poor Gabriella Cilmi.