Um, when Rihanna's era lasted for 9 months and Katy's is STILL going on, TWO years after the album's release, with a re-release and EIGHT ****ING SINGLES, it better.
I can't at people trying to discredit Katy because all her singles are smashes. It's not her fault her singles are more succesful than Rihanna's. It's impressive she can sell 30M singles + 5.5M albums