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HILARY: THE BODY RESET DIET
Hot mama Hilary Duff gives her body a "reboot" with the delicious smoothie blends from fitness and nutrition guru Harley Pasternak.
THE PLAN: The three-phase plan kicks off the first five days with an all-smoothie diet (think "apple pie" blends with apple and Greek yogurt and a green smoothie with kiwi and strawberry) before incorporating healthy solid foods like veggies and low-fat hummus and even an indulgent grilled steak and spinach salad in phase three.
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ASHLEY: SUNFARE DIET
Twilight star Ashley Greene maintains her toned physique with the super-convenient Sunfare diet, which delivers fresh daily meals that include gluten-free and vegetarian options.
THE PLAN: There are hundreds of meals available through Sunfare, such as hazelnut cherry oatmeal for breakfast, cajun tuna salad for lunch, citrus herb chicken for dinner and a cottage cheese snack.
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GWYNETH: THE ALLERGY-FREE DIET
Gwyneth Paltrow shares the restorative recipes she turns to when she needs to lose weight and boost her energy in her book It's All Good. That means cutting out foods that are deemed bad: bread, deepwater fish, chicken eggs, sugar and red meat.
THE PLAN: Gwyneth kicks off every day with a green juice pumped full of kale, apple, lemon, mint and ginger. Lunch could be a beet-greens soup, followed by a snack of almonds soaked in water (which digest better than raw) and then a BBQ chicken dinner using her own paprika-spiced recipe.
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JESSICA: WEIGHT WATCHERS
As one of the faces of Weight Watchers, Simpson follows the PointPlus system (a program that limits food intake by giving point value to food, meaning nothing is off-limits!), which the star is using to get back to her pre-baby body shape.
THE PLAN: Tasty low-cal meals from the upcoming book What to Cook Now include Italian baked eggs for breakfast, three-mushroom barley soup for lunch, a chicken quesadilla snack and chicken and vegetable kebabs with rice pilaf for dinner.
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KIM: ATKINS DIET
The new mom uses the low-carb Atkins Diet, which aims to kick the body's metabolism into gear by introducing a diet filled with veggies and nutrient-rich foods.
THE PLAN:: Kardashian has already shed 50 lbs. with typical meals like a two-egg omelet with cheese and spinach for breakfast, grilled salmon with asparagus for lunch, greek yogurt with berries and almonds for a snack and chicken breast with healthy greens for dinner.
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OLIVIA: FRESH DIET
Newsroom star Olivia Munn loves the convenient delivery of the perfectly portioned and nutritious Fresh Diet, which comes with a cooler bag filled with a selection of meals, sides and snacks.
THE PLAN: The day might start with a breakfast of boiled eggs, sliced tomato and mango, followed by chicken salad for lunch, a veggie burger (sans bun) for dinner and a snack filled with peanuts, dried fruit and turkey bacon.
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VICTORIA: EATING THE ALKALINE WAY
Victoria Beckham can thank the Alkaline Diet for her slender figure. The plan focuses on eating a balanced diet that's low in acidity, which can stress out the digestive system, according to the book, Eating the Alkaline Way.
THE PLAN: Breakfast begins with healthy plain yogurt and berries, followed by quinoa with sliced avocado and diced chicken breast for lunch, brown rice sushi and seaweed salad for dinner and hummus and carrots to snack on.
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BEYONCé: 22 DAY VEGAN DIET
It's all about teamwork! And that's why Beyoncé and husband Jay-Z embarked together on a 22-day vegan challenge by cutting out all animal products with the help of trainer and nutritionist Marco Borges and his 22 Days Nutrition Program.
THE PLAN: The vegan-only diet kicks off with vanilla chia pudding and berries for breakfast, red cabbage and green apple sesame slaw with sweet potato for lunch, hummus with vegetables for an afternoon snack, black bean and quinoa salad for dinner and a dark chocolate dessert.
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The Modern Family bombshell gets her va-va-voom curves by keeping toned with the nutrient-filled gourmet diet delivery meal program Freshology.
THE PLAN: Scrumptious blueberry pancakes for breakfast, anyone? Lunch might be a chicken wrap, then followed by stuffed peppers for dinner and berry-topped flan for dessert.