Britney Spears shaping up for gig

Singer Britney Spears is sweating it out to stay in shape for her upcoming performances in Las Vegas.

Spears, 31, will be performing as part of Las Vegas residency later this year.

"The performances won't be simple, they'll be a massive party from start to finish," dailystar.co.uk quoted Spears as saying.

"To pull this off, I have to be in top condition and running at full speed. 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," she added.