Katy Perry (born Katheryn Elizabeth Hudson on October 25, 1984) is an American dance-pop singer. She has released four studio albums and an EP. In November 2007, Perry released an EP album called Ur So Gay. This song has been criticized and labelled homophobic.[1] On June 17, 2008, Perry released her first pop album called One of the Boys with singles including: "I Kissed a Girl", "Hot N Cold", and "One of the Boys". She has a contralto vocal range. Her third album titled "Teenage Dream" was released in August 2010 and included the singles, "California Gurls", "Teenage Dream" and "Firework". She is the only female artist to get 5 number one singles on one album. The songs are: California Gurls featuring Snoop Dogg, Teenage Dream, Firework, E.T. featuring Kanye West and Last Friday Night. The only other artist to get 5 number ones on one album is Michael Jackson. Perry became the celebrity with the most followers on Twitter in November 2013