Kesha Rose Sebert (born March 1, 1987), better known by the mononym Kesha is an American pop singer, rapper and songwriter. Her debut single, "Tik Tok", released in late 2009, reached number one in eleven countries and was the first Billboard Hot 100 number one of the new decade in 2010. Her debut album, Animal, was released in January 2010 and debuted at number one in the US. By March, Kesha had sold a million albums and eight million singles worldwide.