Pixie's 'sexercise' to keep fit 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 bared all in a recent photoshoot? Which pop princess donned a sports bra costing $20,000?

Here's the lowdown on the latest fashion news!

'Sexercise' keeps Pixie Lott in shape

The secret behind Pixie Lott's fabulous figure has finally been revealed -- her man Oliver Cheshire has attributed her chiselled body to lots of sex.

"I love eating a proper meal and there is no way I could go on a diet or watch what I eat," the Daily Star quoted Cheshire as saying.

"To keep in shape I have lots of sex. I call it sexercise," he said.

According to him, he doesn't get any complaints from Pixie, 21, about what he's packing downstairs.

Chatting about his recent swimwear shoot for Marks & Spencer he said: "I wasn't nervous about posing in swimwear as I've been in my pants since I was 15 and was born naked."

"Plus, I don't need to stuff," he added.

Petra Nemcova has called off her engagement to Jamie Belman, just two months ahead of their wedding.

The 32-year-old supermodel and the actor plans to tie the knot after a whirlwind eight-month romance in January 2011, and their ceremony had been planned for June this year.

"Petra Nemcova and Jamie Belman confirm their separation," the Daily Mail quoted a statement for Nemcova's agency, Next Models as saying.

"They remain close friends and thank their families for their continued support during this time. There will be no further comment on the matter," the statement read.

Former Dancing With The Stars contestant Nemcova had been due to wear a Marchesa wedding dress, which she had picked out in summer last year, at the ceremony.

Kim Kardashian stripped down to nearly nothing for a recent retro photoshoot, and gave fans a sneak peek on Instagram.

The reality star, who has more than one million followers on the photo-sharing site, which was recently bought by Facebook, shared the racy pic on Thursday night, the New York Post reported.

For the sexy shoot, Kardashian seems to channel her inner Brigitte Bardot, posing in black lingerie with pouty lips and big, tousled hair.

According to US Weekly, Kardashian recently shed 10 pounds in 10 days before a family trip to the Dominican Republic.

The curvy star says she dropped the weight by cutting out gluten, dairy and sugar.

Kim, Khloe and Kourtney Kardashian, whose home decor line is their fourth collaboration with Sears, get cozy and pose close to one another in their latest ads for their new collection.

In the photo, the trio is seemingly nude as their bodies are draped in their Sears line's plush blankets.

Kourtney, who is currently pregnant with her second child, took to her blog to gush over the new collection, which reflects the personal styles of each of her sisters.

Kourtney's brown-hued collection is called 'Desert Dreams'.

"It's always been a dream of mine to have my own home line," the New York Daily News quoted Kourtney as writing,

"I'm completely obsessed with interior design and the way my home look and feels is so important to me. Home is definitely where the heart is, so it's really important that my house reflects my personality! We tried to put our own personal touches into this line and we hope you love it as much as we do!" she added.

Miranda Kerr's delicious being has been reproduced in a 3D image to make it even more desirable.

Kneeling down with her butt stuck out, wearing the tiniest, tightest pair of black shorts and a red work out top, Orlando Bloom's wife stares out seductively from the ad, the Mirror reported.

Miranda is also wearing a pair of Reebok Easytone trainers, which are the whole point of the campaign. They give the wearer's legs and butt a workout while walking.

The lady herself went up onto the windy roof of the Bayerisch Hof Hotel in Munich, wearing the same outfit, to give fans and the press a double whammy of leering pleasure.

Heidi Klum, who is approaching 40, is posing nude for Allure's May issue.

The mother of four can be seen flaunting her toned physique and discussing why she's never gone under the knife.

"I'm proud to be able to say, in this day and age, I haven't done anything," People Magazine quoted her as telling Allure.

"Everyone has a view of what's not pretty and (plastic surgery) just doesn't look pretty to me," the 38-year-old added.

As the face of the new Hasbro game Twister Dance, Britney Spears got decked out in workout gear from BodyRock Sport by Kelly Dooley, including their limited-edition 'Eternal Love' bra that is adorned with 18K gold hardware and embellished with Swarovski crystals throughout.

In the photos, the 30-year-old pop superstar showed off her toned abs and trim figure in the French silk and nylon racerback sports bra and 'Jessica' moto leggings.

"Couldn't be happier with the Twister Dance video shoot! It's gonna be so hot..." Us Magazine quoted her as tweeting on Wednesday, along with preview promo photos from her shoot.

Cameron Diaz has set up her own wellness organisation.

The super-fit actress has decided to throw all her energy into helping others get healthy.

"Everyone needs to find a purpose, and I think mine is to help other people. This project is only in the blueprint stages, but I'm creating a space where I can teach healthy habits that girls can build on," Contactmusic quoted her as telling InStyle Magazine.

"I see women struggling with their bodies because they don't know how they work on basic levels, starting with nutrition. The more I talk about this with people, the more I realise how much it's needed. I'm really throwing all of my energy into it," she added.

Madonna, whose eagerly anticipated debut signature perfume Truth or Dare by Madonna hit department store Macy's last week, has already made plans for an accompanying fragrance and men's cologne smelling of a "good old whiskey."

Following in the footsteps of popstars such as Christina Aguilera and Beyonce Knowles who have built up prolific fragrance lines, the songstress said her second perfume should be due out "sometime next year", although details remain limited.

In an interview with WWD, the singer added that men's fragrance is an avenue worth exploring, an idea that has been inspired by her teenage daughter Lourdes.

"I think it would be good to do a men's fragrance, as well," the New York Daily News quoted her as saying.

"My daughter thinks so. She wants to wear it. She likes to wear men's cologne -- don't ask me why," she said.

While work has not yet begun on the possible project, Madonna revealed the powerful aroma of hard liquor appeals.

"I love musk and amber and woody kind of fragrances on men. I love the smell of whiskey -- we should make a men's cologne that smells like whiskey. I can't drink it, it's too strong, but it smells amazing -- a really good old whiskey," she added.

Katy Perry has started wearing blue wigs, as her own hair is getting damaged due to constant colouring.

The 27-year-old has apparently a whole suitcase full of different-coloured blue wigs.

"Katy's own hair began to get damaged because of all the dyeing, so she's started wearing wigs," the Daily Star quoted a source as saying.

However, the pop star doesn't want fans to notice her wig.

"Katy wants the wigs to look as real as possible so they are all cut and styled by her own hairdresser," the source added.

Jennifer Garner, who gave birth to a son this February, is in no hurry to lose her baby weight.

The 39-year-old actress recently gave birth to her third child, Samuel and while she would like regain her pre-baby figure, she said she's too busy to worry about it.

"Jennifer has had a yoga instructor at the house a couple of times, but she's not throwing herself into a hardcore gym routine yet. She does feel she's gained more weight this time around, because she was so busy with the girls that she found herself not eating healthily. But she hasn't had time to really think about it," Contactmusic quoted a source close to her as saying.

"Still being in her maternity wear is her motivation, but it's only been a few weeks -- it's just not a priority right now," the source said.

After her previous pregnancies, Ben Affleck's wife has said she felt pressured to lose her baby weight, especially as she gains so much when she's expecting.

"I do feel pressure, but I can't seem to be pregnant without gaining 45lbs, so there's not a lot I can do about it," the source quoted her as saying.

Natalie Portman has revealed that her style has changed since she became a mother to her baby son Aleph, as she wants to look more mature.

The 30-year-old Oscar-wining actress welcomed Aleph into the world last June.

"I've been trying to look more like a lady recently. I used to be happy in a tee-shirt and sweatpants, and now I feel like I want to make myself a little more grown-up -- now that I'm a mom," Contactmusic quoted her as telling WWD.

The Black Swan star also said that she loves vintage fashion because there's always a story behind the outfit.

"I feel like you are sort of stepping into history. It's really amazing to get the story of where a dress has been; you know, that it has lived through many people's stories," she added.