A host of stars from the words of film, television and fashion were on hand to help Princess Eugenie celebrate her marriage to Jack Brooksbank.
Pixie Geldof, Naomi Campbell, Kate Moss, Liv Tyler and Tracey Emin were among the first celebrities to arrive at St George’s Chapel in Windsor on Friday morning.
Hollywood A-lister Moore wore a maroon dress and fascinator while Tyler and Campbell both opted for all-black outfits.
Actress Tyler arrived with husband - and David Beckham's best friend - David Gardiner, as guests held on to their hats as they battled the wind.
Singer and model Geldof went for more vibrant wedding attire, wearing a bright pink flowing gown.
Supermodel Cara Delevingne also wore black, opting for black trouser suit and black top hat, breaking with tradition.
Moss was spotted inside the church alongside daughter Lila, wearing a polka dot dress.
Cressida Bonas and Chelsy Davy - who once dated Prince Harry - both opted for navy blue dresses for the big day.
Robbie Williams, who is a good friend of the Royal couple, arrived with his wife and fellow X Factor judge, Ayda Field.
But Williams’ mother in law, Gwen Field, lost her hat as she walked towards the chapel. It was retrieved by another guest walking behind.
Williams was later spotted chewing gum as he sat in the royal stalls inside.
The couple's daughter Teddy is set to be a bridesmaid on the big day.
Holly Candy seemed to be channelling Audrey Hepburn in a pale pink 1960-style shift dress, arriving with husband Nick Candy.
Guests arrived holding their hats in the windy conditions, and staff were seen replacing a fallen potted tree which was knocked over onto the West Steps of the venue.
Eugenie and Jack are the the 17th royal couple to celebrate their marriage at Windsor Castle.
Downton Abbey creator Julian Fellowes and wife Emma Kitchener, a lady-in-waiting to Princess Michael of Kent, and David Emanuel, best known for designing, with his former wife, the wedding dress worn by Diana, Princess of Wales, in 1981, also attended.
Other guests included former footballer Jamie Redknapp, property developer Nick Candy and wife Holly Candy, the singer formerly known as Holly Valance, reality TV star Ollie Proudlock and Holly and Sam Branson.
Presenter Richard Bacon, a guest, said those invited were given “Eugenie and Jack mints” when they arrived at the nearby central meeting point, the Royal Farm Shop in Windsor Great Park.
Another 12000 members of the public, who were selected by ballot will listen to a live broadcast in the grounds of the castle.
The Queen's granddaughter will marry Mr Brooksbank, 32, in front of thousands of well-wishers in the same chapel where the Duke and Duchess of Sussex married earlier this year.