The Kardashians go topless 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!

Who's the hottest female celebrity on Twitter? Which supermodel has given fitness a sexy twist?

Here's the lowdown on the latest fashion news!

Kim, Kourtney and Khloe go topless in new denim ad

Kim, Kourtney and Khloe Kardashian, have gone topless in a racy photoshoot to promote their denim line for Sears.

The stylish sisters presumably wanted to put the focus on the jeans.

"Kourt, Khloe and I decided to go natural," Us Weekly quoted Kim as writing on her blog on Monday.

The sexy snap, which has the famous reality TV sisters pose dramatically "in only our favorite jeans", was shot by photographer Nick Saglimendi.

Kim seems very satisfied with the results.

"I think it's such a beautiful shot and Khloe and Kourtney both look so stunning!" she wrote.

In more Kardashian news, Kim took to social network website Twitter to reveal her freshly-coloured hair, which she says she is already "loving."

For the newly single reality star, who is attempting to bounce back from her ill-fated 72-day marriage to NBA player Kris Humphries, new hair colour denotes new beginnings.

"New hair color = new beginnings for me," New York Daily News quoted her tweeting on Monday.

"I swear I love changing my hair up," Us Magazine also quoted her as saying.

"It makes me feel like a new me! It's like the season was ending so I wanted a fresh start now. I'm loving it," she said.

One Twitter photo shows the brunette bombshell puckering up to the camera as she flaunts her famous assets in a sexy coral bikini top.

The 31-year-old's hair colorist, Rebecca Friedman, co-owner of the Goodform Salon in Hollywood, California, feels that "a little bit of change is nice" for the star.

"With everything she's gone through, a little bit of change is nice," Us Weekly quoted her as saying.

Freidman said it took nearly three hours to perfect Kardashian's hue, which she described as a "cooler, chocolate-y brown" with "sun-kissed streaks that are close to her childhood colour."

"It was really great," she said.

"It's possible that she'll want to go lighter, but she's definitely keeping it like this for now," she added.

She's well into her 40s, but supermodel Helena Christensen can give women half her age a complex.

In her latest smouldering campaign for shoe giant Reebok, the Danish beauty poses in a bondage leotard and trainers that complement her curves.

Helena and Reebok have teamed up for a venture that sees the brand conducting a European survey to find out what women find most satisfying in life.

The Daily Mail reports that the Danish beauty "has revealed that keeping fit gives her a strong sense of satisfaction." Hence the bod, we're guessing!

She has also added that she enjoys curling up in bed with a good book, spending time with her son, travelling, photography, watching beach sunsets and eating good food.

The Reebok campaign is also supported by actress Eva Mendes.

Penelope Cruz is the latest celebrity to join hands with PETA for its anti-fur campaign in US.

The Spanish actress has condemned the use of real fur by posing on a 70-foot billboard, which is set to be displayed outside New York's Madison Square Garden.

The 37-year-old, who is married to actor Javier Bardem, turns her head to look over her bare back next to the words, 'Give Fur the Cold Shoulder', in the advertisement.

The billboard will be up throughout New York Fashion Week, from February 9-16 and similar campaigns will take place in London and Milan as the brunette beauty condemns the use of real fur for clothing.

"Penelope Cruz has appeared on every 'best-dressed' list in the world, and the one thing you'll never see her wearing is fur," Contactmusic quoted Yvonne Taylor, PETA Senior Programme Manager, as saying.

"One couldn't ask for a more fitting emblem of the modern, glamorous woman who knows that there's nothing more beautiful than a woman who has a look that kills without anyone having to die for it," Taylor added.

Claudia Schiffer insists that her priorities changed when she became a mother, and work is no longer the most important thing in her life.

The German supermodel has three kids with her director husband Matthew Vaughn.

"I come from a big family, and I always wanted to have kids of my own. Before I met Matthew, I worked non-stop. But once we got together, suddenly a whole new world seemed to open up. And when I had my first child, my priorities became completely different," Contactmusic quoted her as telling Stylist Magazine.

"Motherhood made me feel, 'This is what I'm all about.' You stop worrying. Matthew and I are a team, we make all our decisions together, whether it's about the children or the house. We're not divided in any sense," she said.

Once consumed by work, the 41-year-old model now insists that she can't imagine her family living anywhere else.

"I've lived in Paris and New York, where I love the pace, but this has become my favourite city. It's got everything you could want and it has a lovely villagey feel; there are parks and gardens everywhere in London."

"There is a sense of community in the neighbourhood we live in, in Notting Hill, and it's also really easy to get to the countryside. I've fallen in love with it, and I'm so glad I ended up here. It's thanks to Matthew; it's where love brings you," she added.

Jennifer Love Hewitt shows off her ample assets in a racy new photoshoot.

The 32-year-old actress leaked a sexy pic of herself on Twitter on Wednesday, in which she is next to a hunky, shirtless male model, Us Magazine reported.

The photograph has her sporting black lingerie and fishnet tights, as she shows off her famous cleavage while draping herself over a sofa.

Hewitt will reprise her role as a Texas housewife-turned-stripper in a TV version of Lifetime's popular 2010 movie The Client List.

Rihanna, who tweets racy and provocative snapshots of herself on Twitter, has been named the 'Hottest Woman' on the social networking site by a magazine.

The 23-year-old singer topped the poll conducted by Complex, beating models Kate Upton and Adriana Lima.

The list placed Upton in second and Lima in third position, Contactmusic reported.

Zoe Saldana and Nicole Scherzinger rounded off the top five.

Beyonce, Cassie, actress Emmanuelle Chriqui, Shakira and model Candice Swanepoel also managed to make it to the top 10.

Lady Gaga's private teacher has attributed her achievements to practicing Bikram Yoga.

Tricia Donegan, a former college soccer player, met the singer before she got famous.

"Lady Gaga is something very special, because she is a woman of service," the Daily Mail quoted him as telling The New York Times Insider.

"She uses her talent to make this world better, and that's because she practices yoga."

"She is blessed that she has talent, but what's special about her is that she's going to change the world," he said.

'Bikram' is based on the traditional yoga techniques carried out in sweltering temperatures of 105 degrees Fahrenheit.

The practice, popularised in the '70s by guru Bikram Choudhury, is hard work and normally consists of a 90-minute session in sauna-like temperatures where 26 different postures are carried out.

The 25-year-old is said to have started Bikram Yoga back in New York in 2004 before she was famous.

Rachel Weisz's campaign for L'Oreal's age-defying beauty products has been banned for using digitally enhanced or airbrushed images to even out her complexion.

The Oscar-winning actress, who has always taken a stand for natural beauty even once suggested a ban on the use of Botox by fellow celebrities.

But on Wednesday, the Advertising Standards Authority(ASA) announced a ban on the magazine advertisement for L'Oreal's Revitalift Repair 10, which features her.

It ruled the image 'misleadingly exaggerated' the performance of the product, the Daily Mail reported.

The pronouncement has been welcomed by Lib-Dem MP Jo Swinson, who is campaigning against the use of airbrushing and unrealistic images of beauty in advertising.

L'Oreal defended the way the image of the actress had been altered.

"The ad sought to represent Rachel Weisz as favourably as possible and therefore every effort had gone into ensuring the most flattering set-up," the firm said.

"Rachel Weisz had been professionally styled and made-up and then lit and shot by a professional photographer in a studio setting."

"The photo was shot using a lot of light in order to make the picture more flattering and to reduce the appearance of imperfections in the ensuing image by giving the image a soft focus and lower resolution."

The company owned up that the image had been eventually retouched.

"We considered that the image had been altered in a way that substantially changed her complexion to make it appear smoother and more even," the ASA said.

"We therefore concluded that the image in the ad misleadingly exaggerated the performance of the product," it added.

Halle Berry, who already has her own fragrance, has now launched her own line of shoes.

The '5ths Avenue by Halle Berry' collection, designed for German retailer Deichmann Shoes, comes six months after Cindy Crawford posed with her own range of Deichmann heels.

Like Crawford, Berry is 45 and the ad shoot shows off her enviably toned legs as she slips on her new shoes.

The actress' spring/summer range of 40 limited-edition pairs of footwear will boast peep toes with wedge heels, high-heeled sandals with straps and high-heeled sling sandals on wedge heels.

Berry said it was a "dream come true" to have her own collection.

"Women have always loved shoes," the Daily Mail quoted her as saying.

"It's like if your hair is not right and your shoes are not right, the woman is not right. If both of them are right, you're pretty much okay. And shoes are a statement. They can be very sexy; they can say something about where you are in the day; they can say what your mood is; they give you a chance to accessorise."

"And I'm a girl that loves to change my shoes all the time. It's an expression of who you are really. I'm a girl if I find a shoe that I really like I like to get them in all colours. I'm big on that. "

"I would say I'm a nude girl because this goes with everything. You can dress it up and dress it down."

"I can't think of any girl who wouldn't want her name on a brand of shoes. I think that's pretty cool," she said.

In her Deichmann commercial, Berry gets so caught up in the shoes and changes of outfit in her dressing room that she is late on a film set.

She said that she like the way the ad portrayed her.

"I like the concept of it. It really relates to my life and who I am as a person and what I do for a living. And I think there's kind of a fun element to it. And it also speaks to my love of shoes," she added.

The company, which is Europe's largest shoe retailer with more that 50 UK stores has previously signed up the Pussycat Dolls and the Sugababes to promote its shoes.

Berry's shoes will go on sale in the UK from early March, with prices starting at 29.99 pounds.

Tilda Swinton, who is frequently praised for her unique, androgynous style, has revealed that she takes a fuss-free approach to dressing for red carpet awards shows and simply wears what her friends choose for her.

Swinton said that unlike many other Hollywood actresses, she does not enlist the help of a personal dresser when she gets ready for illustrious events.

"For me, it's just a matter of having a box cutter to open the (dress) box. There is a little effort that goes into the planning, like, weeks ago but at this stage, it's only a matter of opening the box," Contactmusic quoted her as telling People Magazine.

Swinton was surprised to learn that other actresses have a slightly more high-maintenance routine when it comes to dressing for the red carpet.

"You mean there's somebody in your hotel room who actually takes your clothes out of a suitcase and lays them out for you?" she said.

It seems that the Chronicles of Narnia star puts her trust in her friends, who send her ready-to-wear outfits for awards shows.

"I turn up in a pair of old corduroy trousers, and I'm very fortunate to have friends who send me boxes (with gowns). It's like the Cinderella complex. It's the friends that make the effort, not me," she revealed.

Amy Winehouse's father Mitch has slammed her catwalk look-alikes at designer Jean Paul Gaultier's show.

The 60-year-old said the catwalk 'tribute' at Paris Fashion Week was a 'total shock'.

Mitch accused Gaultier of cashing in on Amy's death with a "bad taste" fashion show.

Mitch said, that the late singer's family was devastated by pictures of catwalk models smoking and wearing her trademark beehive hairdos and heavy eyeliner.

Wednesday's show at Paris Fashion Week was held just two days after the half-year anniversary of the Back To Black star's death and Mitch claimed that it portrayed Amy at her worst.

"The family was upset to see those pictures, they were a total shock," the Sun quoted him as saying.

"We're still grieving for her loss, and we've had a difficult week with the six-month anniversary of Amy's death."

"To see her image lifted wholesale to sell clothes was a wrench we were not expecting or consulted on."

"We're proud of her influence on fashion, but find black veils on models smoking cigarettes with a barbershop quartet singing her music in bad taste."

"It portrays a view of Amy when she was not at her best, and glamorises some of the more upsetting times in her life. That's upsetting for her family," he added.

Amy died at the age of 27 at her home in Camden, North London, on July 23, 2011, after battling drink and drug problems.

Lea Michele is the face of Candie's spring marketing campaign, titled 'Hangin at Home.'

The 25-year-old follows in the footsteps of the brand's previous faces including Britney Spears, Vanessa Hudgens and Fergie.

In a newly released ad for the shoe giant, the Glee star strikes a seductive pose while reclining atop silk linens and furry pillows.

"It's amazing. Candie's is such an iconic brand. The apparel is so adorable as well as affordable -- and who doesn't love that?" Contactmusic quoted her as telling People.

"The concept is about enjoying being at home, feeling relaxed, comfortable and happy," she said.

Iconix chief marketing officer Dari Marder has said that Lea, who describes her personal style as "simple and comfortable", was a natural choice for the brand.

'Everyone is obsessed with Glee, especially Lea Michele, and so are we," he said.

The 25-year-old beauty also said that it was fun to put her Glee alter-ego Rachel Berry aside to do the shoot.

"I love playing Rachel, but being an actor, it's always fun to switch things up and play around and be someone else for a little while," she added.