Katy Perry Greatest Hits – Top 25 Biggest Selling Singles What’s your Reaction? +1 0 +1 0 +1 0 +1 0 +1 0 Facebook Twitter Email Katy Perry Greatest Hits – Top 25 Biggest Selling Singles. American singer Katy Perry has released four studio albums, one live album, two extended plays (EP), twenty-two singles (two as featured artist), and five promotional singles. < Tweets by katyperry