1: Long trousers
Ever wondered why you and a taller friend may both be the same dress size, but she looks slimmer? It's all down to height - and celebs know that one way to create the illusion of this is to wear trousers that skim the ground. When trying on a new pair, stand slightly on tiptoe in your bare feet - trousers which just touch the floor when you're standing like this are the perfect slimming length.
2: High heels
Long trousers are one way to create height, and heels are another. The two together are the ultimate combination, in fact. A killer pair of stilettos will give you a longer, leaner line whatever you're wearing. All this plus a sexy Marilyn Monroe-esque walk - what more could you ask for? Get heel-training now!
3: Show off your best feature
She may be the curviest ex-Spice Girl, but Emma Bunton knows that as well as womanly curves, she's got a killer pair of pins. Take a tip from her and don't be afraid to show off a slim pair of legs or arms - it will give the illusion that the rest of you is just as skinny, too!
It's an oldie but a goodie, ladies. Yes, you can try on an outfit in a dozen colours - and yet the one which is nearly always the likeliest to make you look slimmest is the black one. If you're getting bored of the same old safe LBD, though, add some colour with bright shoes, bags or jewellery.
5: Figure-hugging clothes
A style of dressing which Catherine Zeta-Jones has down to a fine art. Instead of hiding underneath baggy clothes, choose ones which hug your figure - they really are more flattering. We're not talking squeezing into (or bulging out of) your outfits, just choosing clothes on the basis of a good fit - not the size label.
6: Low waists
No, we don't mean waists so low that your stomach hangs over them (has no greater fashion crime ever been committed by British women?). We're talking trousers with short zips, that sit on or just above your pelvis bone. This is the most flattering style for bootylicious babes - the least flattering being any type of trouser or jeans that sits at waist height and/or cuts your bum in half at the back.
7: One colour all over
One colour or pattern worn all over will usually make you look slimmer than if you combine a patterned top with plain bottom, or vice versa. If you don't like wearing patterns, wearing shades of a similar colour all over will have a similar slimming effect: think beiges worn with chocolates and tans, mint greens worn with turquoises and emeralds, and so on.
8: No spaghetti straps
If you want to look your trimmest, don't wear tops or dresses with spaghetti straps, or if you do, wear a cute wrap, shawl or bolero cardi over them. You can still show off your arms and look fabulous, though, by wearing the Salma Hayek staple: wide straps with a V-neckline. This is by far the most flattering style for those of us with less-than-stick-thin arms.
9: Big top or bottom - not both
None of us want to wear ultra-figure-hugging clothes all the time - but if you do plan to don anything big and baggy (combats, ponchos, gypsy skirts) then make sure that the rest of you is lean 'n' mean. Underneath an enormous ponchos, for example, you can bet your bottom dollar that J.Lo is wearing a pair of slim-fitting jeans and a figure-hugging top.
10: Magic undies!
Last but not least, the one that all celebs swear by: control underwear. Gripper knickers are one of showbusiness's best kept secrets and they're worn by loads of celebs - even slim twentysomethings. Gwyneth Paltrow is a fan of Spanx. Pull them on and voilą - a set of A-lister, sucked-in curves can be yours, ladies!