Kesha Rose Sebert (born March 1, 1987), better known by the mononym Kesha ( stylized Ke$ha), is an American pop singer, rapper and songwriter. At age eighteen, Kesha was signed to Dr. Luke's record label and publishing company. Although an active musician since 2005, singing background vocals and writing songs for other artists, her breakthrough only came in early 2009 after appearing on Flo Rida's number one single, "Right Round." Her debut single, "Tik Tok", released in late 2009, reached number one in eleven countries. Her debut album, ''Animal'', was released in January 2010 and debuted at number one in the US. By September, Kesha had sold two million albums worldwide.