Two months after the release of Katy Perry’s song Firework, more than 500,000 digital copies were sold. The number of copies sold for Firework is the fourth highest for female singers in the US. In addition, the song was dubbed one of the most played single in 2011 with estimated 500,000 plays. As of December of 2012, the number of copies sold for Firework was already 6 million in the United States alone. Thus, Firework became Katy Perry is highest selling single among all her songs. Firework is the third single of Katy Perry to hit the five million mark in paid downloads worldwide. This makes her the first ever artist to have three hit songs all reach the five million mark for paid downloads.