Britney Spears is heading to Las Vegas with a two-year residency deal. The former child star, whose hits include 'Baby One More Time' and 'Toxic,' will headline 50 shows a year starting on December 27. Spears hit the big time in the 1990s, and was one of the biggest pop stars of the 2000s. She was a judge on the popular singing competition show, 'The X Factor,' in 2012 but left after one season.
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