Eugenie's fiancé Jack has asked his brother, Thomas Brooksbank, to be Best Man.
The Duke of York has shared a series of family photos on his official Twitter account, as the royal wedding approaches.
The venue is where Harry, younger son of heir-to-the-throne Prince Charles, Wednesday USA actress Meghan Markle at a glittering ceremony in May and Eugenie is copying some of her cousin's plans for her big day.
The daughter of X Factor judge Robbie Williams, Theodora, will join the young royals in the same role at the wedding.
The wedding will feature several of Queen Elizabeth's other great-grandchildren: Savannah Phillips, 7, Isla Phillips, 6 and Mia Tindall, 4.
Following news that over 23,000 people had signed a petition demanding the British government not commit any public money to the Oct.12 nuptials, insiders say the princess had a "bridezilla meltdown" and the "wedding rehearsal from hell".
Ten-year-old Viscount Severn and Lady Louise Mountbatten-Windsor, 14, will also be part of the wedding as special attendants.
It's become clear that Princess Eugenie's father, Prince Andrew, has been up to something special!
Once married, Princess Eugenie and Mr Brooksbank will be taken on a short carriage procession along part of Windsor High Street. As friends of Eugenie's, it's likely they'll be returning to St George's Chapel.
The Queen will host a wedding reception at Windsor Castle for the couple and their guests.
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