Rihanna goes topless again 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 is the curviest celeb of all time? Which sultry actress is launching a line of innerwear?

Here's the lowdown on the latest fashion news!

RiRi shares 'topless picture' while preparing backstage for Atlanta gig

Rihanna stunned her followers on Instagram by uploading a sultry topless image of herself, while getting her hair done for an Atlanta concert.

The 25-year-old pop star, who chilled out by the pool in Miami a day before the show, could be seen wearing nothing but a pair of yellow underwear, the New York Daily News reported.

The Diamond singer held up a towel that barely covered her modesty, showing off some serious tan lines.

"Show time!! #DWT," she captioned the photo.

Gwyneth Paltrow, who was recently named World's Most Beautiful Woman, was seen flaunting her incredible body in a sheer dress at the Iron Man 3 premiere on Wednesday.

The 40-year-old actress walked down the El Capitan Theatre's red carpet in a Antonio Beradi dress, which had sheer panels that ran down the sides of her gown, the New York Post reported.

The Oscar winner's toned legs and bottom could be seen through the frock.

Marilyn Monroe has been named the most attractive curvy celebrity of all time.

The screen siren, who beat modern models like Kelly Brook, Christina Hendricks and Kim Kardashian, topped a poll more than 50 years after her death, with four out of ten voting for her, the Daily Star reported.

The Hollywood star was joined in the top five by actresses Raquel Welch, Sophia Loren and Jayne Mansfield.

Meanwhile, 33-year-old Brook is the only current celeb to make the top five.

Reality TV star Kardashian received just seven percent of votes, while actress Hendricks got five percent.

The study marked the launch of the "curvaceous" Peugeot RCZ Sports Coupe.

The car's designer Boris Reinmoller told the publication that the appeal of the curve and old-school Hollywood glamour will never go out of fashion.

Reinmoller said that there is no one to match the curvaceous wonder of late actress Monroe.

Sofia Vergara has decided to add a shapewear line to her existing Kmart collection.

According to WWD.com, the 40-year-old actress is expanding her collection to include toning bodysuits, camis, tanks, bustiers, waist-shaping briefs and boyshorts, thigh slimmers, and half and full-slips, the New York Post reported.

Vergara, who posted a photo of her shapely rear after her 2012 Emmys gown split from the back and wailed via Tweet before the ceremony, "nothing fits meeee!!!!" told WWD that usually, when she goes to an event, she wears shapewear.

She said that it's not to hold anything in, but to smooth everything out, and she does make it a point to wear a bra with her garments.

The curvy stunner said that each of the undergarments have been Vergara-approved.

She said that she is not really a designer, but her lines are based on what she likes and what she wears.

Vergara added that they have a lot of meetings and all of the products get tried on by her.

The items run M to 2X and products with built-in bras contain cups sized from 36C to 38DD and 40D.

Demi Moore and Olivia Newton-John have been voted the most inspiring female celebrities for ageing gracefully.

The famous actresses have topped a poll conducted by MyCelebrityFashion.co.uk and beaten the likes of Oprah Winfrey and Helen Mirren to sit at the top, the Daily Star reported.

Moore, 50, bagged the first position after women were asked if they aspired to look like certain celebrities as they grew older.

It was found that 69 percent of the women surveyed said that they did in fact look to certain celebrities as inspiration for ageing gracefully, and would like to look like some when they grow older.

They were then asked to choose from a list of more than 50 female celebrities whose footsteps they wanted to follow in when it came to growing older gracefully.

The poll revealed that the second most graceful ager is Olivia Newton-John, followed by Helen Mirren and US First Lady Michelle Obama.

The top 10 female celebrities voted were as follows:

1. Demi Moore: 55 percent
2. Olivia Newton-John: 41 percent
3. Helen Mirren: 39 percent
4. Michelle Obama: 29 percent
5. Michelle Pfeiffer: 25 percent
6. Twiggy: 19 percent
7. Sharon Stone: 16 percent
8. Oprah Winfrey: 12 percent
9. Jamie Lee Curtis: 9 percent
10. Madonna: 4 percent

Madonna's personal trainer has revealed that it takes discipline, focus, planning, scheduling, diet, creativity, exercise, health, energy, rest, sleep and care to achieve a body like Madonna's.

Nicole Winhoffer, who has been whipping the 54-year-old singer into shape since 2009, said that the songstress sacrifices everything as she wants to be the best, News.com.au reported.

Winhoffer trains Madonna full-time, two hours a day, six days a week, rain, hail or shine.

She joined the Queen of Pop's Sticky and Sweet tour four years ago as a personal trainer for the show's dancers; she was then handpicked to train Madonna herself, replacing her former trainer Tracey Anderson.

Winhoffer advises that if women want to achieve fitness, they should ask themselves "Am I lazy?" If they find that the answer is "yes" or "sometimes", then the next question is "Why" -- and if they answer that it's because of their schedules or because they are busy or don't have time, then they need to schedule time.

She asserted that she worked for the hardest working woman in the world and if she can make time, then so can others.

Winhoffer tells women to mark their calendars with a big and bold "I am going to be the best version of me" and start to accomplish one new change every day.

She said that in order to get results, it's a near-daily commitment; she recommended at least 30 minutes of cardio, and 30 minutes of toning, including arms, abs, legs and back, five to six days a week.

Winhoffer added that the easiest way to trim down is to focus on protein, as it is reliable, keeps people full, makes their metabolism work harder to digest, stabilises blood sugar levels, and makes people lean.

Heather Locklear has revealed that the secret to her great skin is 'semen'.

When asked if she had any recommendations for anti-aging skincare products, Locklear told TMZ.com that "You just put semen on your face," the Huffington Post reported.

It's unclear if the 51-year-old was talking about a cream product or just an ingredient.

Meanwhile, researches have proved that semen may have anti-aging benefits.

Semen as an anti-aging treatment saw a spike in popularity around 2009.

Spermine, one of the components of semen, is high in anti-oxidants and can be used to smooth out wrinkles.

The world's first supermodel Janice Dickinson is reportedly broke and has declared bankruptcy.

She told Radar Online that she is upset over the development and is desperate to pay everyone back.

According to court documents obtained by the New York Post, the 58-year-old is one million dollars in debt -- much of which seems to be attributed to doctor's bills for her plastic surgery procedures.

"I had some trouble, so yes, it is true," she said on Monday morning.

On her list of debtors is Beverly Hills dermatologist Arnold Klein and anti-aging expert Dr Uzzi Reiss, who are both owed more than 8,000 dollars. She also has unpaid taxes dating back more than a decade, with her owing more than half a million dollars to the IRS and the states of California and New York.