Maid of Honour
As expected, Princess Eugenie's elder sister Princess Beatrice, 30, will have the central role of Maid of Honour.
Brooksbank will be keeping it in the family, as his Best Man is his younger brother Thomas. According to his profile on the Troy Asset Management website, the Leeds University graduate "manages UK investor relationships" at the London-based firm.
The Duke and Duchess of Cambridge's only daughter, Princess Charlotte, is now an experienced bridesmaid, having featured at both her Uncle Harry's wedding in May and aunt Pippa's wedding last year.
Savannah Phillips, the seven year old daughter of Peter and Autumn Phillips (Peter is the son of the Queen's daughter Princess Anne) is close to her second cousins, George and Charlotte, as evident by this Trooping the Colour photo of her silencing the heir to the throne, which went viral in June.
Savannah's little sister, Isla Phillips, who is 6, will also be in the bridal party.
Zara and Mike Tindall's four-year-old daughter Mia will join the bridesmaids on the day.
Maud Windsor, 5, is Princess Eugenie's goddaughter, and also a member of the royal family as she is the daughter of Lord Frederick Windsor and Sophie Winkleman (pictured). Frederick is the son of the Prince and Princess Michael of Kent (Prince Michael of Kent is the Queen's first cousin). Maud is also at school with Prince George.
The only non-royal in the brood of bridesmaids has famous parents, nonetheless. Six-year-old Theodora (known as Teddy) is the daughter of Robbie Williams and Ayda Field. Ayda and Robbie are said to be very good friends of Eugenie.
There are only two page boys at Eugenie's wedding. The first is five-year-old Prince George who, by now, must have the hang of these weddings given that he's been in the role twice this year already.
The second page boy is six-year-old Louis, the son of the couple's friends Zoe and Olivier De Givenchy.
Buckingham Palace has also announced there will be two 'special attendants'. The first is 14-year-old Lady Louise Windsor is Prince Edward and the Countess of Wessex's daughter. She was a bridesmaid at Prince William and Kate Middleton's wedding back in 2011.
10-year-old Viscount Severn, whose real name is actually James, is Lady Louise's brother and Edward and Sophie's son.