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A brash and driven pop singer/songwriter, Kesha (Kesha Rose Sebert) was born in Los Angeles but moved at the age of four to Nashville, where her mother -- a longtime songwriter -- had inked a publishing deal. (Over a decade prior to that, Pebe Sebert's biggest success had come with "Old Flames Can't Hold a Candle to You," originally recorded by Joe Sun and later by Dolly Parton.) Before finishing high school, Kesha returned to L.A. for the sake of jump-starting her own music career, despite being set up to study psychology at Columbia. She came into contact with Dr. Luke, the co-writer and co-producer of Kelly Clarkson's "Since U Been Gone" (among several other hits), who was impressed with her demo recordings. Kesha penned the Veronicas' "This Love" and later contributed background vocals to Britney Spears' "Lace and Leather," both of which were released in 2008, but the biggest turning point came in 2009, when she was tapped to contribute vocals on Flo Rida's Dr. Luke-produced "Right...