So you've put on a few pounds over Christmas. Who hasn't? But don't despair.
Instead, take a few tips from the stars who have turned weightloss into an art form: Hollywood's leading ladies.
The Black Book Of Hollywood Diet Secrets, published later this month, takes you inside the fridges of some of the most recognisable faces in the world.
Did you know that Cindy Crawford sips vinegar to kill her appetite before heading out to dinner, or that Demi Moore reaches for apple slices with peanut butter when she wants a sugar fix?
The Black Book's authors, showbiz journalists Kym Douglas and Cindy Pearlman, know the Hollywood scene inside out and can tell you exactly what keeps the world's hottest bodies in A-list shape.
On one of her first assignments, Kym fell in love with the actor she was interviewing, Jerry Douglas, the star of hit U.S. soap, The Young And The Restless.
"When we married, I was thrown into the Hollywood scene," she recalls, "I would show up at all these awards shows and see women who were literally flawless.
"The reporter in me set out to discover what their secrets were, and I've been doing it ever since.
"Over the years I've witnessed how size has become increasingly important in LA," says Cindy.
"Twenty years ago you'd see people with various body types; it was okay to be a size 8 (UK size 12).
"Nowadays, you have to be a size zero. But the biggest secret I learned from celebrities is that they don't do 'diet food'.
"They eat the real thing, just not a lot of it.
"I remember sitting down to breakfast with Elizabeth Hurley and being shocked that she was having real bacon with her eggs, not turkey or tofu bacon.
"And she said: 'I'm just going to have a salad for lunch and a little dinner, so it's fine. But I'm not going to have fake bacon.'
"This book is for real women with real bodies: for the woman going to her school reunion or on a blind date and doesn't want to go on some big crash diet.
"There are little tricks that celebrities do, and if you emulate them, you will see some weight loss."
Demi Moore easts apples with peanut butter while Cindy Crawford sips vinegar before dinner
So what are Hollywood's hottest diet tips? Here's the A to Z of all you need to know...
A IS FOR ASPARAGUS: Celebrities live on it. It's a natural diuretic, it diminishes bloating and is on every Hollywood insider's must-eat list. Actor Owen Wilson never misses his daily double dose of asparagus and parsley.
B IS FOR BRUSH YOUR TEETH: After eating, young starlets rush to the bathroom; not to throw up but to brush up.
The craze was begun by a nutritionist who advised her famous young client that the best way to maintain her mere 15 per cent body fat was to use a toothbrush after every meal.
Nutritionists say it works because the new taste in your mouth signals to your brain that you are full.
Hollywood hunk Matthew McConaughey carries his toothbrush with him to restaurants.
. . . and BENEFIBER: This powdery fibre substance is flavourless but it packs a punch. Celebrities put it in their coffee or sprinkle it on their salads as it helps move food through you system more quickly. Available at Boots, from £2.99.
... and BLUE PLATES: Why? Blue is the least appetising colour for human beings and studies show when you eat from a blue plate you eat less.
C IS FOR FOR COOKIE: The Cookie Diet, followed by celebs such as singer Kelly Clarkson and Oscar-winner Jennifer Hudson, advocates "eat a cookie, skip a meal".
Eat up to four biscuits a day in place of breakfast and lunch. Have a healthy dinner (600-900 calories) and you will lose weight. The diet works as it's based on calorie restriction. See www. hollywoodcookiediet.com.
. . . and CINNAMON: In Chinese medicine cinnamon is one of the herbs most widely used to aid circulation and digestion.
There is evidence that it can lower levels of cholesterol and blood sugar, and relieves gas. Celebrities often sprinkle some in their tea.
Lindsay Lohan drinks coffee with soya but Gwyneth Paltrow favours dandelion tea
There's evidence to suggest that every can consumed daily nearly doubles your risk of being overweight.
Experts believe that diet drink fans tend to eat more as they think they're being virtuous with their drinks.
. . . and DANDELION TEA: A natural diuretic, great for banishing water retention. Gwyneth Paltrow and Madonna are said to be fans.
E IS FOR EPSOM SALTS: By bathing in these, you can actually-soak away the pounds.
The magnesium sulphate in the salts will draw the fluids out of your body. Celebs, including supermodel Heidi Klum, use it and some stars do this to banish bloating before filming.
F IS FOR FITFLOP: This flat sandal-like shoe is made of rubberand trims and tones your legs because the sole activates your muscles mid-step to help tone your thighs, calves and bottom.
Celebrity trainers have the makers on speed dial. They are available in the UK from www.thefitflop.com.
G IS FOR GRAPEFRUIT: Grapefruit oil gives off an aroma that affects liver enzymes and promotes weight loss.
Studies show that animals exposed to grapefruit scent for 15 minutes three times a day showed a reduction in appetite and body weight.
Jennifer Lopez and model Carmen Electra carry vials of grapefruit oil with them.
H IS FOR HIKE: Ultra-slim celebs such as actress Kate Bosworth, Cat Deeley and Renee Zellweger are big fans of hiking as a way to get off the pounds.
Reese Witherspoon takes it one step further by walking backwards to tone her calves and tighten her body, all the while carting along 5lb weights.
I IS FOR ICE LOLLIES: Oprah Winfrey snacks on these when she's hungry.
She likes iced fruit bars because they take a long time to eat and satisfy her sweet tooth.
J IS FOR JAVA COFFEE: Notice how every time you see a photo of celebrities, they are carrying around a huge cup of coffee?
It's what's in the coffee that makes the difference between fit and fat.
If they're in need of a sweet fix, stars use a small amount of real sugar, not artificial sweeteners which can contribute to obesity.
Unsweetened almond or soya milk, which has fewer calories than regular milk but more creaminess than skimmed, is also a celebrity favourite.
. . . and JESSICA SALAD: When singer and actress Jessica Simpson wants to lose weight she eats the same salad at Loggia Italian Cafe in Studio City, California, every day.
They now call it "The Jessica" on the menu.
Make your own version with two chopped Asian pears, ten sliced strawberries, one cup of grilled chicken breast cut into strips, ten romaine lettuce leaves, chopped, a small handful of croutons.
Mix them with a dressing made up of 2tbsp olive oil and 1tbsp balsamic vinegar, one egg yolk and 1tsp Dijon mustard, with salt and pepper to taste.
K IS FOR KNIT: Julia Roberts and Uma Thurman do this to keep themselves from snacking, relieve stress and improve concentration.
L IS FOR LIQUORICE: Eat a piece of liquorice, a strong breath-freshener mint, or a Listerine breath strip when you're hungry.
It might be enough to stop you from eating something that will derail your diet.
Plus, the fresh taste on your tongue will numb your tastebuds.
M IS FOR MATCHA GREEN TEA: This is a concentrated form of tea in which one cup is the equivalent of eight to ten cups of green tea. It boosts your metabolism and also cuts sweet cravings.
N IS FOR NIGHT-TIME: The most important time of day for dieters. Kate Beckinsale's trainer insists that she cut out starchy carbs when the sun goes down.
It's one of the "quickest ways to drop pounds fast".
O IS FOR ONE CHEAT DAY A WEEK: Give yourself one day off a week so you don't feel deprived.
Still-stunning Michelle Pfeiffer allows herself Mexican food or doughnuts on occasion.
P IS FOR PRUNES: Hollywood nutritionists suggest using four chopped-up prunes with the minced beef when you make up a hamburger.
It cuts the fat by 40 per cent and you won't even taste it.
QIS FOR QUICK SUGAR FIX: One Los Angeles bun shop is particularly popular with Hollywood starlets.
But instead of ordering a massive cinnamon roll, they ask for a tiny paper cup filled with icing. That way they satisfy their sweet tooth without eating the calories.
R IS FOR REFUSING: Don't be tempted by gherkins or pickles as Americans call them.
Celebrities never eat them as the high sodium content encourages bloating and water retention. As one said, you "might as well suck on a salt-shaker".
S IS FOR SCALES: Try the Celebrity Weighing Scales. Each benchmark on this scale is not a number but the name of a celebrity - even Bridget Jones.
Boring to know you weigh 135lb but much more interesting to know you weigh the same as Goldie Hawn.
Of course, if we ever hit the Cameron Diaz marker we will all weep with joy. Available in the UK at www.firebox.com.
. . . and SUSHI: Jennifer Aniston and Angelina Jolie live on it.
It's low-calorie, and the vitamin-rich seaweed can lower cholesterol.
T IS FOR THE TEN MINUTES TRICK: When actress Jennifer Garner was trying to shed the 4st she packed on with baby Violet, she played a mental trick on herself.
As she approached her treadmill with dread, she would say: "OK, it's just for ten minutes, after that you can get off the thing. That's no time at all."
She added: "The funny thing is, after the ten minutes I would always want to do another ten minutes, which led to another ten minutes. It's a great way to trick yourself into doing your cardio."
U IS FOR UNDERHAND PHOTOS: They say that the camera adds 10lb? Now there's a camera that makes you look thinner.
The HP Photosmart R937 digital camera trims 10lb off your figure. Celebrities swear by it.
V IS FOR VEGANISM: Alicia Silverstone says that going vegan is the key to lasting weight loss: "I swear it's so easy. You don't have to have a diet mentality at all if you eat healthy, plant-based foods."
W IS FOR WEDGES: According to Hollywood stylists it's the footwear that makes you look the thinnest.
Cameron Diaz, Jessica Simpson and Gwen Stefani all wear wedges for that reason. Stylists love them for cover shoots as it makes the featured actress look taller and slimmer.
Y IS FOR YAZ: An exercise class that combines spinning and yoga and is the current workout du jour in Hollywood.
Actress Rosario Dawson is a fan and says: "It's not only great that I'm feeling strong, but because of Yaz my butt is looking much better these days."
Z IS FOR ZETA JONES: Our Catherine believes in variety: "I'm always mixing it up a little bit between walking, working out in a gym and swimming. I don't do any routine two days in a row."
And the bad news? No one gets off that easy. No matter what these women eat, one thing remains consistent: their workouts.
Cindy Pearlman notes: "These women don't skip the gym - ever.
"If they have to get up at 5am to start filming, they will get up at 3am to work out. They never miss a day."