Along with Princess Charlotte, 3, the five other bridesmaids include Savannah, 7, and Isla Phillips, 6, the daughters of Autumn and Peter Phillips; Zara and Mike Tindall's 4-year-old daughter Mia; Princess Eugenie's goddaughter, 5-year-old Maud Windsor; and 6-year-old Thoedora Williams, the daughter of Adya Field and Robbie Williams.
The bride's sister, Princess Beatrice, 30, has been confirmed as the maid of honour, while Jack's brother Thomas Brooksbank will act as best man. Accompanying the news were several sweet throwback photos of the couple and their siblings to mark the special occasion.
"The family understood, particularly Eugenie, and were fine about it owing to her previous commitment".
Princess Eugenie is close friends with model Cara Delevingne, singer Ellie Goulding, and the Duke of Sussex's former girlfriends Chelsy Davy and Cressida Bonas, all of whom are expected to attend.
She has also asked Robbie and Ayda Williams' daughter Theodora, six, to be a bridesmaid.
The venue is where Harry, younger son of heir-to-the-throne Prince Charles, Wednesday US actress Meghan Markle at a glittering ceremony in May and Eugenie is copying some of her cousin's plans for her big day.
According to Parker, Eugenie's ring wasn't meant to be a copy of Catherine's ring, which originally belonged to Princess Diana.
Queen Elizabeth's youngest grandchildren, Lady Louise Mountbatten-Windsor, 14, and Viscount Severn, 10, will serve as "special attendants". Eugenie, the daughter of Prince Andrew and Sarah Ferguson, is the only royal family member with a public Instagram account.
Mr Brooksbank is a former manager of Mayfair club Mahiki and the couple met while skiing.
It's never ending for the royals!
(AAP) Prince Harry and Meghan Markle were married at Windsor Castle in May.
The carriage will process through the grounds of Windsor Castle, departing via Castle Hill to proceed along part of the High Street before returning to the Castle via Cambridge Gate.