How does she stay so thin? Britney Spears demands Cheetos and cheeseburgers for her upcoming Las Vegas show

By Heidi Parker

Published: 11:07 EDT, 12 December 2013 | Updated: 11:07 EDT, 12 December 2013

Even though she's already 32 years old, Britney Spears is still eating like she's a teenager.

The Toxic singer has requested some very naughty junk food be stocked up for her new Las Vegas show at Planet Hollywood Resort & Casino.

In their December 23 issue, Star magazine reported that on the list is everything from Cheetos to cheeseburgers.

What's her trick?: Britney Spears keeps slim even though she still eats Cheetos and Cap'n Crunch, which Star reported on Wednesday is on the list of things she needs for her Las Vegas show

Junk food junkie: Eating Cheez-Its (left) and a frozen dessert (right) in April

'Britney is insisting on Froot Loops, Pop-Tarts, Cap'n Crunch, Gatorade, Doritos and potato salad,' a source tells the magazine.

'Plus In-N-Out cheeseburgers without buns, a life coach on call 24/7 and 200 fresh towels a day.'

The blonde beauty, who recently showed off her trim figure on the cover of Shape magazine, will start her residency on December 27.

Drive-Thru diva: At Burger King in 2010

The Louisiana native has always had a love for junk food - she is often seen going through fast food Drive-Thrus like Burger King or picking up treats like frozen yogurt, which she did as recently as December 7 in Thousand Oaks, California. So this is not a big surprise.

What is a surprise is how she can keep her trim shape.

Life & Style Weekly gave a hint as to how she keeps those pounds off by reporting she has a personal trainer, who will be heading to Sin City with her.

She will also be taking boyfriend David Lucado, 27, which must be an incentive to stay slender.

'He will live with the singer during her residency,' an insider told the magazine. 'Her team is OK with it just as long as she's happy - that's all they want.'

Treats: Enjoying frozen yogurt with boyfriend David Lucado and son Sean on December 7

Of course the performer is taking a massive entourage with her as well that also includes a chef, an assistant, a driver, extra security, a voice coach, a hair stylist and makeup artist.

'Britney needs a lot of people working for her because this is such a huge show,' an insider said.

'It's all been put in place to keep her going and make sure she can handle things.'

As far as being a part of such a big residency, there are some jitters for the former rehabber.

'She's nervous, which is natural, but she's feeling upbeat and excited!' added the source. 'This is going to be Britney's biggest show ever.'

During her performance the beauty will be belting out tunes like Perfume and Body Ache from her new album Britney Jean, which is expected to sell over 100,000 copies in its first week.

Britney is clearly upbeat about her new show. On Wednesday she posted a photo to Instagram of her giving a Vegas fan an autograph during a promotional appearance there earlier this month.