Britney Spears is on the next cover of Shape magazine and she admits to getting into shape for Vegas!

We've been waiting for confirmation - and now we have it. Brit will be a Las Vegas performer very soon and she is getting her body ready!

She told the magazine that "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."

She looks great to us!