Kesha Rose Sebert (born March 1, 1987), known mononymously as Kesha (formerly stylized as Ke$ha), is an American singer-songwriter, rapper, and actress. 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…