Britney Spears reportedly eats 3,000 calories a day while she undertakes extreme workouts for her Las Vegas show.
The popstar has reportedly been tucking into big meals every single day for the last month. Some of her favourite dishes include Domino's Pizza, McDonald's and In-N-Out Burger.
However, even after guzzling down these deep-fried treats, Britney is still maintaining her trim figure.
She undertakes eight long hours of rehearsals each day for her upcoming Las Vegas show stint, UK's Heat magazine reports.
Because of this extensive exercise the blonde beauty is free to eat whatever she likes without worrying about it going straight to her stomach or thighs.
Other snacks Britney has apparently been enjoying include cheese grits, a porridge-like substance made of corn, and foot-long Subway sandwiches.
Proving this regime works, the 31-year-old mom-of-two recently posted photos of herself in a little blue bikini while filming her new video Work B***h.
In addition to the hardcore rehearsals, Britney is also said to be doing "Olympic-style training" in the space of 40 minutes.
Her trainer Tony Martinez believes these workouts will help her be in top form for her Vegas show.
"She's using all sports right now to get ready for her 90-minute Las Vegas show. It is intense, interval training to keep her heart rate up," Tony recently told E! News. "In a show, she will be dancing and singing non-stop. In her training, she only has about ten to 15 second rests between each set.
"She is doing Olympic-style training. This is hardcore stuff. Britney knew she needed to step up her game. She is just drilling it but she likes too! She loves to sweat and she still talks smack to me."
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