Kate Moss, Emma Watson and Cara Delevingne lead the glamour at Prince Wills' castle charity dinner

His wife may have been at home on baby-sitting duty, but glamour was still the order of the day as Prince William threw open the doors of Windsor Castle tonight.
Guests including models Kate Moss, Cara Delevingne and actresses Cate Blanchett and Emma Watson were among a host of stars of fashion, stage and screen attending a glittering gala dinner to celebrate the work of The Royal Marsden Hospital, of which the prince is president.
Also on the list are Sherlock’s Benedict Cumberbatch, actress Helena Bonham Carter, photographer Mario Testino and Downton Abbey’s Laura Carmichael.
Many will no doubt be disappointed at the absence of the Duchess of Cambridge, a fashion ambassador if ever there were one. Ostensibly, she 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.

A host of stars of fashion, stage and screen attended the glittering gala dinner to celebrate the work of The Royal Marsden Hospital, of which the prince is president. Guests included models Kate Moss, in a sheer black gown with seductive side slit, and Emma Watson in a crisp white shirt and grey Ralph Lauren skirt

Ms Moss and her husband, rocker Jamie Hince wear matching black for the event,  as model Cara Delavigne wears a sparkling halterneck column dress as she stands with photographer Mario Testino outside the castle ahead of the dinner. The A-list guests are all friends or supporters of the hospital

Zhang Ziyi wears dove grey arriving for dinner to celebrate the work of The Royal Marsden

Margot Robbie wears the Pièce de résistance of Ralph Lauren's Fall 2014 collection

Alexandra Shulman, editor-in-chief of Vogue, helped draw up list of the 200 guests at the dinner

And of course there are those who might suspect the glamorous Duchess is all too aware her presence might somewhat overshadow her husband’s big night.
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 (many in Ralph Lauren, naturally) first enjoyed a drinks reception in the historic Waterloo Chamber, built in tribute to the success of Britain’s victory against Napoleon in 1815.
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.
Lauren, 74, and his wife of 50 years, Ricky, made a rare foray away from their home in the US to attend the event with their three sons.
One, David, is married to the niece of former US President George Bush, model Lauren Bush – or Lauren Lauren, to use her married name.
In the Grand Reception Room William  was introduced to Mr and Mrs Lauren, and immediately apologised for the Duchess's absence.
He said: 'I'm sorry my wife's not here, you probably would far rather you saw my wife.'
'Not at all,' said Mr Lauren.
Afterwards, the impossibly beautiful 200-strong party walked through to the 180-foot long St George’s Hall for a lavish three course dinner.

Sherlock Holmes actor Benedict Cumberbatch, dressed in a Ralph Lauren Black Label Peak-Lapel Tuxedo and Dress Shirt. He was joined by an outstanding Helena Bonham Carter, who was also clad head to toe in Ralph Lauren - a Midnight Navy Silk Taffeta & Organza Evening Dress

Downton Abbeys's Lily James and Cate Blanchett  arrive. Ms Blanchett wears an asymmetrical Ralph Lauren Collection Ivory Silk Cady Evening Dress from the designer's AW14 collection,  with Ralph Lauren Watches and jewellery, with Diamond Chandelier Earrings

Model Jessica Michibata, left, who is dating Formula 1 star Jenson Button, arrives at Windsor Castle wearing an elegant strapless red gown. Actress Sophie Turner, right, who is best known for her role in Game of Thrones, opted for a flowing black full-length gown for the elite star-studded dinner event

Ralph Lauren, Ricky Anne Loew-Beer and members of the Lauren family. Speaking before the event, Lauren, 74, said he was excited about meeting the Duke for the first time, having known Diana, Princess of Wales through their common interest in fighting cancer

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 Cate 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

The Duke also told Mr Lauren: 'It’s a wonderful thing you’re backing, it will be another great addition to the hospital.'

A MEAL FIT FOR A (FUTURE) KING

STARTER
Seared hot-smoked salmon with apple and pink peppercorn puree on a salad of broad beans, green beans and sugar snaps 
MAIN COURSE
Roasted fillet of beef with caramelised shallot and tarragon butter, orange braised baby gem, steamed English asparagus and a Jersey Royal and summer herb crush
PUDDING
Chocolate and salted caramel tart with creme fraiche ice cream and caramelised bananas

When Mr Lauren said he had been looking at several possible projects, the Duke smiled and said: 'You’ve chosen wisely.'
After meeting Mr and Mrs Lauren and The Royal Marsden’s chairman Ian Molson and chief executive Cally Palmer, the Duke met Emeli Sande before making his way into the Waterloo Chamber, where the 220 guests were sipping champagne and eating canapés.
One of the first people he spoke to was Benedict Cumberbatch, who later said he felt 'guilty' for spending so much time chatting to him.
He said: 'He is just a stand-up guy. I completely forgot to ask him how he got over his jet lag from his trip to Australia because I was there at the same time and I saw all the commotion when he went to Sydney Opera House.
'Hopefully tonight will raise awareness of the work of The Royal Marsden - that’s what we’re here for. Cancer isn’t a disease that needs much awareness but it does need continued funding for research.'
The Duke also chatted to Laura Carmichael, one of three Downton Abbey stars at the event, together with Allen Leech, who plays former chauffeur Tom Branson, and Lily James, who plays Lady Rose MacClare.
Miss Carmichael, whose mother is a radiographer, said: 'We’re halfway through shooting the next series of Downton Abbey but the Duke didn’t ask for any plot details. He is probably waiting until it comes out in September.'

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.  The Duke also told Mr Lauren: 'It's a wonderful thing you're backing, it will be another great addition to the hospital'

Helena Bonham-Carter arrived alongside Ms Shulman. The actress later revealed she met the prince on the island of Mustique. She said: 'I got very drunk at one point and I was determined to ask him to be a godfather to my daughter. He quite wisely said no'

His wife may have been at home on baby-sitting duty, but glamour was still the order of the day as Prince William threw open the doors of Windsor Castle tonight to guests including model Kate Moss and actress Emma Watson

The stars of fashion, stage and screen were attending a glittering gala dinner to celebrate the work of The Royal Marsden Hospital, of which the prince is president

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 (pictured), who has announced he is funding an entire new breast cancer centre at the hospital

The prince chatted with Ms Moss who crossed one arm casually across her as she grinned and laughed at what he was saying

William¿s designer-clad guests (many in Ralph Lauren, naturally) first enjoyed a drinks reception in the historic Waterloo Chamber, built in tribute to the success of Britain's victory against Napoleon in 1815

The Duke meets actress Cate Blanchett. 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

The Duke of Cambridge with Ricky and Ralph Lauren and Royal Marsden Chairman Ian Molson. In the Grand Reception Room William was introduced to Mr and Mrs Lauren, and immediately apologised for the Duchess's absence

The Duke of Cambridge with Ricky and Ralph Lauren and Royal Marsden CEO Cally Palmer. He said: 'I'm sorry my wife's not here, you probably would far rather you saw my wife.' 'Not at all,' replied Mr Lauren.

One of the first people he spoke to was Benedict Cumberbatch, who later said he felt 'guilty' for spending so much time chatting to him, adding: 'He is just a stand up guy'

The Duke also chatted to Laura Carmichael, one of three Downton Abbey stars at the event, together with Allen Leech, who plays former chauffeur Tom Branson, and Lily James, who plays Lady Rose MacClare

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

Dinner: The host looks contemplative during the celebratory charity dinnner at Windsor Castle

Standing next to Miss Carmichael was Helena Bonham Carter, who said: 'The Duke and I met before, along with the Duchess, before they were married, when I was staying on Mustique.
'I got very drunk at one point and I was determined to ask him to be a godfather to my daughter. He quite wisely said no. I admire him. He has got the same grace as both his parents.'
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 Cate 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.
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.'

Star-studded: Cara Delevingne poses with Kate Moss, left, while Prince William greets pop star Emeli Sandé

Stars: Lily James, Cate Blanchett and Kate Moss pose for a photograph during the Windsor Castle reception

Delight: The Duke of Cambridge looks pleased to greet celebrity photographer Mario Testino, who has taken his picture in the past

Chat: The pair entered into an animated conversation after their reunion

Dynasty: The Lauren family posed for a photograph in front of portraits of the Georgian monarchs

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.
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 is 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 is 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.

Kate Moss and Jamie Hince pictured leaving their London home on the way to Windsor Castle

The supermodel was clad in black and 'fur', with her tousled hair worn loose around her shoulders as she made her way to the castle

Mr Lauren, who is reportedly worth £4 billion, will now launch the Ralph Lauren Breast Cancer Centre as part of a new philanthropic partnership with the hospital.
Speaking before the event, Lauren, 74, said he was excited about meeting the Duke for the first time, having known Diana, Princess of Wales through their common interest in fighting cancer.
He said: ‘I’m looking forward to it. He’s taken up his mother’s movement. Tonight’s not a fashion moment as far as I’m concerned, it’s a moment of connection.’
Speaking about the Duchess of Cambridge, who sometimes wears his clothes, he told the Evening Standard: ‘Everyone loves her in the US. She’s got a charming way about her and she’s very beautiful. I think she’s doing her job - as the Prince’s wife and mother of the future king - perfectly.
‘And the Prince comes across as a good guy - they seem like a couple you’d want to talk to - real people.’
Lauren was introduced to the staff of The Royal Marsden by Alexandra Shulman, the editor-in-chief of Vogue and a trustee of the Royal Marsden Cancer Charity, who also helped draw up list of the 200 guests at the dinner.
The Royal Marsden is the oldest, largest and most comprehensive cancer centre in Europe, with a history of ground-breaking research.