Kim X-rays her butt and more fashion news!

Welcome to the weekly fashion round-up, where we bring you the latest on supermodels, style, designers and everything in-between!

Which supermodel has shared the secrets behind her perfect body? Which starlet underwent an X-ray to prove she doesn't have implants?

Here's the lowdown on the latest fashion news!

Kim Kardashian gets X-ray to prove she's not had butt implants!

Socialite Kim Kardashian has had a butt X-ray to put rumours she has implants to rest.

Kardashian, 30, accepted her sisters Kourtney and Khloe's dare to go though with the butt X-ray to "show the whole world" they are for real.

"My sisters have dared me to get a butt X-ray, because there are so many people claiming I have butt implants and I'm so tired of them," Contactmusic quoted Kim as telling a doctor in the latest episode of Keeping Up With the Kardashians.

"I really just want to get it so I can show the whole world," she stated.

Khloe suggested to the medic, that rather than going to the trouble of an X-ray, "you could just feel her ass up and see if it's real."

"You're a doctor -- you'll know," she added.

In more Kim-related news, it seems the curvy starlet wants nothing less than the perfect bridal dress for her wedding with Kris Humphries, after being spotted at Vera Wang in New York City.

Kardashian, joined by Kourtney, checked out the famous designer's gorgeous gown offerings in the presence of a film crew. And it seems she has even asked the Wang staff designing her wedding dress to sign confidentiality agreements!

Though Kardashian's wedding date has not yet been made public, recent reports suggest that the brunette beauty and her NBA playing fiance have made their decision as to when to tie the knot.

"The date that close friends of the family are being given is toward the beginning of August. They are looking at private estates in Los Angeles, since location will make it much easier for guest flying in to attend," Gossip Centre quoted an insider as saying.

Project Runway's host Heidi Klum has revealed her curves in a daring promotional image for the new series of the show.

The 39-year-old model and mother of four posed with a pair of scissors and a pink tie ribbon around her neck. On her arm was written the catchphrase of the show's co-host Tim Gunn -- 'Make It Work'.

"This is definitely sexier than past campaigns we've done," the Daily Mail quoted Klum as saying.

The ninth season of the reality show is set to debut in the US on July 28 with Kim Kardashian joining the panel of fashion experts.

Heidi is also all set to launch her second line of costume jewellery called 'Wildlife by Heidi Klum' for QVC this autumn.

The feat follows her previous stint of designing jewellery for the retailer with jeweller Wajdi Mouawad in 2006.

According to the supermodel, she enjoyed the process of creating a cheaper costume collection more than working with fine jewellery.

"I feel free now with this. I can reach more people with costume jewellery, the prices are great and I can make big pieces. It's way more fun," the Daily Mail quoted her as saying.

The 35-piece collection will range in price from 30 to 200 dollars, and features semi-precious stones such as smoky quartz and opal.

It includes pendants, bold cuffs and cocktail rings, all of which have been designed on a bold scale.

"All of the pieces are statement pieces," Klum added.

Eva Mendes has become the new face of Thierry Mugler's 'Angel' perfume, taking over from actress Naomi Watts who posed as the face in 2008.

Mendes, 37, who revealed her new campaign is due out in September in New York, posed in a campaign picture, taken by Inez van Lansweerde and Vinoodh Matadin, in a strapless evening dress while holding the bottle of perfume close to her neckline, the Telegraph reported.

Mugler had launched the star-shaped scent, which was specifically formulated to recreate childhood memories, and is famous for smelling just like chocolate, in 1992.

The scent created by Givauden includes patchouli praline, caramel and vanilla.

Jessica Alba has revealed the secret behind her glowing skin -- regular use of sunscreen.

The 30-year-old actress, who is currently pregnant with her second child, admitted that though her beauty routine is very simple, it has always worked for her.

"My mother always told me to wash my face every night, wear sunscreen during the day and drink plenty of water. It's simple but I like to think that it works for me," Contactmusic quoted her as telling StyleList.com

"I like sunscreen that's not too heavy, so I use my daughter's California Baby," she said.

She also added that she uses lipstick on her cheeks.

"Before there was cream blush, my grandmother would apply lipstick on her lips, cheeks and eyes. I still do that today," she added.

Supermodel Elle Macpherson has revealed that a strict organic diet and regular meditation are the secrets behind her perfect body.

The 48-year-old has revealed that she has been receiving guidance from celebrity trainer James Duigan -- her fitness instructor for more than a decade.

The mother of two boys also said that though she has no longer been running eight miles every day in recent years, she still regularly works out.

"I love working with my trainer James Duigan, although I'm nearly 50 now, so I have different requirements to when I was 20," the Daily Express quoted her as telling Radio Times.

"I don't run eight miles a day like I used to. I eat organic food and drink lots of water and I take time for meditation to set up my day," she added.

Former Hills star Audrina Patridge has said that women should not be afraid of wearing a bikini because she thinks anyone could look good in it.

The reality star, who spends a lot of time in a bikini, also added that she does not think twice before wearing one.

"I don't even think twice about wearing a swimsuit because it's always been a part of my lifestyle," Fox News quoted her as telling Shape Magazine.

"But I have girlfriends who are so afraid to show their bodies, they won't take off their towels at the beach or pool. It's a shame because everyone can look good in a suit," she said.

Well, maybe Audrina has it easier than others! Actress Christina Hendricks has revealed that she finds it difficult to buy bathing suits for herself because of her breasts.

The Mad Men star is known for her curvy figure, but says her fuller chest and small waist make it difficult to source suitable beachwear.

"It's really hard to find a bathing suit if you have breasts. You either get smooshed down or there's no support," Contactmusic quoted her as telling Lucky Magazine.

Hendricks also said her problems extend to finding dresses to wear to red carpet events.

"I have to be careful about my proportions and keep it simple. What works for me is structure and something that shows my waist," she said.

"No one will send me dresses. Designers loan size 2 or 4 samples to actresses, but I'm not that size. It's like I'm a freak because I'm curvy and I can't squeeze into those things. I've had some problems with that," she added.

Spanish model Elen Rivas has posed naked and bloody, with four spears in her back for a controversial ad by animal rights group PETA against bullfighting.

Rivas, 36, who is the ex-fiancee of England footie ace Frank Lampard, said the ad was nothing compared to what really takes place.

"My ad might be graphic, but it's nothing compared to the bloody, violent reality of bullfights," the Sun quoted her as saying.

"Most Spaniards are opposed to this barbaric blood sport, and PETA and I are urging tourists not to be fooled by the industry's propaganda."

"There is absolutely nothing romantic about torturing and killing animals for entertainment," she stated.

Campaigners hope the ad, which is set to stir up a new debate on bullfighting, will persuade British tourists not to see a bullfight while on holiday in Spain, where the sport is still widespread.

"In a typical bullfight, men on blindfolded horses drive lances into the bull's back and neck, impairing the animal's ability to lift his head," PETA campaigner Mimi Bekhechi said.

"Others plunge banderillas, which are sticks with harpoon points, into the bull's back."

"Finally, after the animal has become weak from blood loss, the matador attempts to kill the bull but often only succeeds in further maiming the animal," Bekhechi added.

The down-to-earth Duchess of Cambridge loves to sneak into posh London shops hunting for clothes and beauty tips, without having anybody notice her.

One of Kate Middleton's favourite is Peter Jones department store in Sloane Square, where she regularly goes as she is treated just like any other customer.

The staff over there realised it was her only when they spotted the distinctive engagement ring that had belonged to Princess Diana.

"She loves the idea of still being normal and the fact she can come in and no one looks twice at her," the Daily Star quoted a shop insider as saying.

"Even though millions of people saw her on the television for the royal wedding she looks quite ordinary in real life. We only realised who it was when we saw that incredible engagement ring," he added.

During her recent trip, the 29-year-old reportedly spent 30 minutes at the Bobbi Brown make-up counter discussing a brown eye shadow.

Usher has asked Pippa Middleton to 'name her price' to launch his new undies range.

The American entertainer has reportedly been trying to set up a meeting with the 27-year-old to make the contract a big success.

"I don't think there's a more beautiful, more stunning, more talked-about woman in the world at the moment," the Daily Star quoted Usher as saying.

"I'm sure everybody is trying to sign her up," he said.

"She won't be cheap, but she has the looks and the popularity to really establish a new product," he added.

Daisy Lowe must have hurt pop diva Christina Aguilera as she stepped into her shoes as the 'face' of celebrity jeweller Stephen Webster's designs.

"Working with Daisy has been a doddle compared to Christina," the Daily Mail quoted Webster as saying.

"Her only stipulation was that we pick her up for shoots from Wales because she was there with her boyfriend Matt Smith," he said.

The Doctor Who actor and Lowe have been dating each other since last year.

British retailer Debenhams has launched the lightest ever tee-shirt bra.

Weighing less than two ounces, the 18 pounds tee-shirt bra has a moulded cup that is glued together rather than stitched.

Almost half as light as most bras, it weighs a fifth of the typical gel push-up varieties.

Trials found the lingerie gives the sensation of being naked under clothing, feeling like a "second skin".

"The search for a bra that fits, flatters and is comfortable is as hard as finding the right man. We're confident once women try this, they will never wear another tee-shirt bra again," the Daily Express quoted Sharon Webb, Debenhams' head of lingerie buying and design, as saying.