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They are two of the most famous faces on the planet.
On Tuesday evening, Kate Moss and Cara Delevingne joined Prince William for an exclusive charity dinner celebrating the work of The Royal Marsden. The event, sponsored by fashion designer Ralph Lauren, was held at Windsor Castle.
Despite the 19-year age difference, both Kate and Cara looked equally stunning in their elegant black gowns, fitting perfectly with the regal setting.
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Number one: Kate Moss arrived for a dinner to celebrate the work of The Royal Marsden hosted by the Duke of Cambridge at Windsor Castle on Tuesday evening
Double trouble: Kate was joined by her fellow model Cara Delevingne
Kate, who was seen leaving her home with her husband Jamie Hince not long before, looked particularly youthful.
The 40-year-old radiated wearing a slinky black dress which featured a thigh-high split and one long sheer sleeve.
Her hair, which was styled with plenty of volume, fell loose and she accessorised with a simple silver box clutch bag.
Strut: Kate acted as if she was on the runway as she made her way to the castle
Dashing date: The model was joined by her husband Jamie Hince
She’s used to castles! Harry Potter actress Emma Watson posed up as she arrived
Perfect setting: Helena Bonham-Carter fitted in perfectly with the castle wearing a typically dramatic dress
Cara, 21, also opted for black picking an elegant gown with an intricate beaded bodice and long skirt.
The aspiring actress pulled her locks off her face in a severe bun and she wore lashings of dramatic dark make-up.
Their arrival was shortly followed by British actress Emma Watson, who once again showed she likes to take fashion risks.
Flanked: Rita was joined by famous photographer Mario Testino (R) for the dinner
From Australia with love: Cate Blanchett was the picture of elegance in a white dress which had a Grecian feel
Slinky in silver: Margot Robbie’s look was almost Seventies with her big hair and interesting dress
The Harry Potter actress looked older than her years wearing a full grey skirt with a crisp white shirt, with dark lipstick and her hair pulled off her face in a rather old fashioned style.
Her one-time co-star Helena Bonham-Carter was also in attendance and looked right at home against the dramatic back-drop of the castle.
The 47-year-old stunned wearing a rather extravagant black dress which was strapless, with a very ruffled skirt.
Man of the moment: Ralph Lauren, who is sponsoring the evening was joined by wife Ricky Loew-Beer
Regal: Jensen Button’s model girlfriend Jessica Michibata looked incredible in a red strapless dress
Smooth operators: Zhang Ziyi looked incredible in an intricate silver dress, while Benedict Cumberbatch looked dashing
On the up: Game Of Thrones star Sophie Turner had a princess moment in black, as did Downton Abbey actress Lily James (R)
Helena wore her hair off her face in an interesting chignon, while her make-up was equally as powerful.
It wasn’t just the most well-established actress’s who attended – stars of the moment Sophie Turner and Lily James were also invited.
Game Of Thrones star Sophie had a real princess moment in a one-shoulder black dress with full skirt.
Good friends: Once inside the reception Kate and Cara spent time chatting to each other
We wonder what he said: Kate broke into giggles as she chatted to Prince William
Laughter: As the reception got under way William was seen making his guests laugh (L-R) Douglas Booth, Allen Leech, Lily James, Cara Delevingne and Laure Carmichael
Her peer Lily, who stars in Downton Abbey, wore an incredible beaded and feathered black and silver dress.
Guests came from across the globe to celebrate the work of The Royal Marsden, including Cate Blancett and Margot Robbie from Australia.
The actresses pulled out all the stops with their ensembles, showcasing very different styles – Cate went for a simple white dress, while Margo opted for a Seventies glamour vibe in grey with big hair.
What a setting: The guests sat down to eat in the stunning St George’s Hall in the castle
Good to see you: Emma seemed to be having a rather earnest chat with the Prince
Prince William is hosting the event to raise awareness of London’s Royal Marsden cancer hospital – one of Princess Diana’s favourite charities.
It is expected that most of them will style themselves in Ralph Lauren creations in honour of the sponsor.
However, one key royal will not be in attendance as Kate Middleton has turned down the invitation to go along with her husband.
Fascinated: Kate stood with her mouth agape while the prince chatted to her
Full of ruffles: Helena spent time catching up with Ralph and his wife Ricky
William became president of the Royal Marsden Hospital in 2007 and is keen to enhance his philanthropic profile.
His backing for Mr Lauren’s connection with the Marsden will be seen as his picking up the baton from his mother – who was also the hospital’s president.
William, who is said to have personally asked the Queen for permission to host the gala dinner, is expected to give a brief welcome and address in which he will thank Mr Lauren for extending his philanthropic work to the Marsden.
Ralph Lauren’s company is the ‘Official Outfitter’ for the Wimbledon tennis championships and his personal association with William and the Marsden will see him take a further step into the upper reaches of British society.
After a three-course dinner, singer Emeli Sande will serenade guests for the finale of the evening.
The event wont be as social media friendly as last week’s Met Gala as guests have been warned that security will be tight and have been asked to leave mobile phones and cameras at home.
Radiant: Helena looked beautiful as the light fell on her as she arrived in her car
Dolled up: Kate Moss looked every inch the glamorous supermodel she is celebrated to be as she was spotted making her way into London on Tuesday
Suited up: Jamie looked dapper in his black suit which matched Kate’s black gown and fur shawl
Natural beauty: The supermodel has minimal make-up on ahead of the exclusive dinner
Off they go: Kate and Jamie will join guests including Cara Delevingne, Oscar-winning actress Cate Blanchett, Harry Potter heroine Emma Watson and Sherlock star Benedict Cumberbatch
