Kesha Rose Sebert (born March 1, 1987), known as Kesha (and formerly Ke$ha), (pronounced ) is an American singer, rapper, and songwriter. In 2005, at age 18, Kesha was signed to producer Dr. Luke's record label, Kemosabe Entertainment, and publishing company. Although an active musician since then, singing background vocals and writing songs for other artists, her breakthrough came in early 2009 after appearing on rapper Flo Rida's number-one single, "Right Round", although she was uncredited. Her debut album, Animal, and her first extended play, Cannibal, were released in 2010. Kesha's music and image propelled her to immediate commercial success, with Animal debuting as the number-one album in the United States. She also achieved two number-one singles, "Tik Tok" and "We R Who We R", and a string of top ten hits from the album and its re-release. At the same time, she continued to write songs for other artists, including "Till the World Ends" for Britney Spears. Warrior, her second studio album, was released in December 2012, spawning Kesha's eighth top-ten hit with "Die Young". "Tik Tok" is among the best-selling digital singles in history, selling over 14 million units internationally.