She’s known for her show-stopping curves which she put on show in a variety of risque ensembles to portray ‘The Duchess Of Bay Ridge’ in The Wolf Of Wall Street.
But Margot Robbie went for a more sophisticated look as she prepared to meet real royalty, The Duke of Cambridge, at a dinner to celebrate the work of The Royal Marsden Hospital, held at Windsor Castle in Berkshire, England on Tuesday evening.
The 23-year-old stunned in a floor-sweeping gown, featuring a silk cross-over top and satin skirt.
Grey matter: Margot Robbie stunned in a backless dove-grey gown as she attended a dinner hosted by the Duke of Cambridge to celebrate the work of The Royal Marsden, held at Windor Castle on Tuesday evening
As she twirled around, the Australian star revealed the dramatic backless feature of the outfit.
Margot accessorised her evening attire with a matching grey suede clutch and a pair of heels hidden underneath her long train.
The usually blonde star swept her recently dyed brown locks up to reveal a pair of chandelier-style drop earrings featuring amethyst gems.
Matching: Margot accessorised her evening attire with a matching grey suede clutch and a pair of heels hidden under her silky train
Show-stopping: She swept her recently dyed brown locks up to reveal a pair of chandelier-style drop earrings featuring amethyst gems
Complementing the hue of her dress, the gorgeous actress applied a smokey eye and nude lip for makeup.
Other guests at the lavish affair included models Kate Moss, Cara Delevingne and fellow actresses Cate Blanchett and Emma Watson.
They were among a host of stars of fashion, stage and screen attending the glittering gala dinner to celebrate the work of The Royal Marsden Hospital, of which the prince is president.
President: The Duke of Cambridge, seen here addressing his guests, is the President of The Royal Marsden and hosted the dinner to celebrate the work of the hospital
A vision in white: Cate Blanchett looked the part for a royal affair as she strolled into the lavish event
Also on the list were Sherlock’s Benedict Cumberbatch, actress Helena Bonham Carter, photographer Mario Testino and Downton Abbey’s Laura Carmichael.
And as if that wasn’t glitzy enough, the event was leant an extra dose of allure courtesy of its sponsor, fashion designer Ralph Lauren, who has announced he is funding an entire new breast cancer centre at the hospital.
William’s designer-clad guests first enjoyed a drinks reception in the historic Waterloo Chamber, built in tribute to the success of Britain’s victory against Napoleon in 1815.
Please to meet you: Cate giggled as she chatted to the dashing prince
Hollywood meets royalty: The Duke of Cambridge mingled with all of his A-list guests, including actress Emma Watson and model Kate Moss
The chambers’ walls are covered with limewood carvings dating back to the 1680s, while the floor is covered with an Indian carpet woven by the inmates of Agra prison for Queen Victoria’s Golden Jubilee which is thought to be the largest seamless carpet in existence, weighing in at two tonnes.
The guests then made their way into the Great Hall, where they took their places at two long rows of tables.
The Duke sat between Ralph Lauren’s wife Ricky and Mr Molson. Opposite him was Ralph Lauren, who had Blanchett on his left and Lady Bamford, wife of the JCB founder Lord Bamford, to his right.
Also seated near the Duke were David and Julia Koch, the American billionaire philanthropists.
Striking: Model Cara Delevingne went for understated chic in a floor-length black dress, with her hair piled high on her head and dark eye make-up, and Zhang Ziyi also went for floor-length in dove grey
Suited up: Sherlock actor Benedict Cumberbatch looked handsome in a smart tuxedo
Theatrical: Helena Bonham Carter wore a dark blue gown that featured complex layering, her hair styled into a dramatic updo, while Lily James looked glamorous in a detailed gown which featured embellishment at the top
Before the meal, the Duke made a speech in which he spoke of the ‘brilliant work’ of the hospital and thanked Ralph Lauren for his ‘incredibly generous’ decision to fund the new breast cancer research unit at the hospital’s Chelsea site.
He added: ‘I am enormously grateful to Ralph Lauren for his generosity, and to all of you who so kindly support the hospital.
You should know that what you do saves lives and gives hope to thousands of people.’
Afterwards, the impossibly beautiful 200-strong party walked through to the 180-foot long St George’s Hall for a lavish three course dinner.
Understated: Emma Watson paired a crisp white shirt with a beautiful floor-length grey skirt, a swipe of berry lipstick helping to make the outfit pop, while Kate Moss was chic in a black dress that featured a split
Many will no doubt be disappointed at the absence of the Duchess of Cambridge, a fashion ambassador if ever there were one, who is still on maternity leave.
But royal aides have also made clear that she and William want to keep their engagements and charitable projects largely separate (although Kate has visited the Royal Marsden with her husband) in order to spread their influence more widely.
William became President of the hospital in 2007, taking up a position once held by his mother. Last year he watched surgical procedures in one of the world famous cancer care centre’s operating theatres.
Family and friends: Ralph Lauren, who funded the new breast cancer research unit at the hospital’s Chelsea site, Ricky Anne Loew-Beer and members of the Lauren family posed together prior to dinner
He also supports the work of the Royal Marsden Cancer Charity, a member of the Charities Forum of which the Duke and Duchess of Cambridge and Prince Harry are patrons.
Officially, the dinner was being held ‘to celebrate the innovative work of The Royal Marsden and bring together the Hospital’s world-leading consultants, supporters and philanthropists’.
Unofficially, it was a chance to dazzle wealthy supporters with an impressive array of royalty and celebrity to ensure their continued generosity.
The A-list guests are all friends or supporters of the hospital, and after dinner they were looking forward to a performance by the award-winning singer Emeli Sande.
Designer Ralph Lauren himself had a benign brain tumour removed 25 years ago and lost his close friend Nina Hyde to breast cancer in 1990.
He has donated millions to cancer research around the world over the past 20 years including the proceeds from UK sales of his Pink Pony range of clothing and accessories to The Royal Marsden.
The Royal Marsden is the oldest, largest and most comprehensive cancer centre in Europe, with a history of ground-breaking research.
Magical: St Georges Hall was the venue for dinner, where guests took their places at two long rows of tables