Katheryn Elizabeth Hudson (born October 25, 1984), known professionally as Katy Perry, is an American singer, songwriter, and television judge. She has been recognized for her influence on the pop sound and style of the 2010s. Perry became the first artist to have multiple videos reach one billion views on YouTube. Perry is one of the world's best-selling music artists, having sold over 143 million records worldwide. She has nine Billboard Hot 100 number one singles, three Billboard 200 number one albums and has received various accolades, including four Guinness World Records, five Billboard Music Awards, five American Music Awards, a Brit Award, and a Juno Award. Perry has been included in the annual Forbes lists of highest-earning women in music from 2011 to 2019. Her Super Bowl halftime show performance is the most watched in history. She is also the most followed woman on Twitter, with over 108 million followers.