Britney Spears has broken her silence about plans to take over Las Vegas during a magazine interview about her health and fitness regime. Fans of the Toxic singer have been waiting for her to confirm reports she'll be staging a Sin City residency for weeks after her manager revealed he was talking to two casino resorts about the possibility of staging a long-running Britney show. The long-rumoured residency will begin this autumn (13), according to insiders, and now Spears herself has let it slip that she's getting in shape for the run of concerts. In a new interview for Shape magazine, she reveals that she is preparing for the high-energy gigs by focusing on yoga and cardio sessions. She tells the publication, "The performances won't be simple - they'll be a massive party from start to finish. And, to pull this off, I have to be in top condition and running at full speed." Reports suggest the shows will be staged at the Planet Hollywood casino.