Britney Spears

Britney Spears is hitting the stage this fall in Las Vegas in an elaborate residency production, she tells Shape magazine.

"The [Vegas] performances won't be simple—they'll be a massive party from start to finish," Spears says in the May 20 issue. "And to pull this off, I have to be in top condition and running at full speed."

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The former X Factor judge will be performing at the Planet Hollywood casino and resort on Las Vegas Blvd. every other weekend, beginning this fall, for a two-year run.

"I'm doing 90 minutes of yoga twice a week in addition to a lot of cardio—hour-long sessions three times a week with my trainer, Tony Martinez," Spears told the magazine.

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