After being put through her paces for the show which starts in January, the star has unveiled her new slimmer physique on Twitter.
Posing in her cut-out underwear (we're not quite sure what we're calling that creation), she showed off her toned tummy.
As she prepared for a photoshoot, she tweeted: "F* sneaky peak on my shoot 2day from my bb yolo"
Lauren previously vowed to lose weight after being unhappy with pictures of herself on holiday back in March.
She lost over one and a half stone on the Cambridge Diet plan, but admitted she had later put a lot of the weight back on.
But after quitting 'TOWIE' earlier this year to appear on 'Dancing On Ice', Lauren is likely to drop more dress sizes as training for the show continues.