One year ago Katy Perry's summer anthem, "California Gurls," debuted at no. 2 on the Billboard Hot 100 singles chart and sold nearly 300,000 digital downloads in its first week on the market. The release of that song sparked what would become a historic year for Perry, her associates and music as a whole. Following that momentous single were the just-as-dominate follow-ups "Teenage Dream," "Firework" and "E.T." featuring Kanye West. It's impressive enough that all four aforementioned singles off of Perry's sophomore album, Teenage Dream, have reached the no. 1 spot on the Hot 100. But even more astonishingly, their chart successes have amalgamated into one full year of pop dominance for the 26-year-old California native, making her the first artist ever to spend 365 consecutive days in the top ten section of the prestigious Billboard chart. That's quite a feat by anyone's standards. Congratulations Katy, Dr. Luke, Benny Blanco, Max Martin, Stargate, Kanye and all of the others who had a hand in the songs! For more information on the achievement, such as how long each song spent at the top, visit Billboard.com.