There is a hot demand for Britney Spears in Vegas. The pop singer has nabbed a twelve-million dollar deal to extend her residency through 2017. She helped Planet Hollywood's earnings increase by twenty-million dollars with her hit single Piece of Me. A number of shows have been added on to Spears' lineup. Spears has sold out almost all of her shows thanks to her dedicated fans, and took to Instagram to express her happiness over performing in Sin City..