Bitch wait....your comparing Gaga's BTW sales ( wich are basically 1 year old) with katy's TD sales ( wich are basically 2 years and half old), not to mention that your only compared their record sales, Gaga Cultural impact in the UK >>>> Katy's, gaga's tour power >>>>>> Katy's, gaga can sell out STADIUMS while katy could barely sell out two nights at the O2...sol let not go that far Ma'am.