How many copies did the single " We Are Never Ever Getting Back Together " sell in the UK as of January 2013 ?
On the week ending January 8 , 2011 , " Firework " sold 509,000 digital downloads in the US which is tied with Lady Gaga 's Born This Way as the fifth highest amount ever sold by a female artist behind Taylor Swift 's " We Are Never Ever Getting Back Together " ( 623,000 ) and Kesha 's " Tik Tok " ( 610,000 ) , Swift 's " I Knew You Were Trouble " ( 582,000 ) , Perry 's own Roar ( 557,000 ) and ninth highest overall .