How many records did Katy Perry sell?

Katy Perry has sold over 18 million albums and 135 million singles worldwide, making her one of the best-selling music artists of all time. Her album " Teenage Dream" (2010) is the only album by a female artist to have five number-one singles on the US Billboard Hot 100 chart, and her single "Fireworks" is the best-selling digital single of all time by a female artist.