The flowergirls and pageboys included the likes of Prince George, Princess Charlotte, Louis de Givenchy (the son of JP Morgan banker Olivier de Givenchy), Savannah and Isla Philips (the daughters of Eugenie’s cousin Peter Philips), Mia Tindall (the daughter of Eugenie's cousin Zara Tindall), Maud Windsor (Princess Eugenie’s Goddaughter) and Theodora Williams (daughter of singer Robbie Williams).
Lady Louise Windsor, the youngest granddaughter of Queen Elizabeth II and Prince Phillip, chaperoned the bridal party as they made their way from the car and up the front steps into St. George's Chapel at Windsor Castle.
Princess Charlotte melted the hearts as she waved enthusiastically from the car en route to the ceremony.
But not everything went so smoothly - Louis de Givenchy had a slight tumble as he made his way up the stairs.
Prince George and Princess Charlotte won over royal spectators from the front of the chapel.
The sweet tots then made their way down the aisle in front of celebrity guests and royal family members, including Robbie Williams, Ellie Goulding, James Blunt Prince Harry and Meghan Markle, Princess Beatrice, Queen Elizabeth, Prince Charles and Prince Philip amongst others.
During Princess Eugenie's nuptials to Jack Brooksbank, cheeky Prince George kept the other children entertained with his mischievous antics.
And when the ceremony was over, the thrilled bridal party cheered and waved at the crowd below, alongside the bride's mother Sarah Ferguson, and maid-of-honour, Princess Beatrice.