Katheryn Elizabeth Hudson (born October 25, 1984), known professionally as Katy Perry, is an American singer, songwriter and television judge. She has released five studio albums and two EPs. In 2001, she released a Christian album named after herself, "Katy Hudson". In November 2007, Perry released the music video for her first single, "Ur So Gay". She has a contralto vocal range. Perry became the most-followed person on Twitter in November 2013. She has earned nine number-one singles on the "Billboard" Hot 100, five of which are from one album (she became the first female artist to achieve this record). Perry has also been nominated for 11 Grammy Awards.