Prince William and Duchess Catherine's children, five-year-old Prince George and three-year-old Princess Charlotte, will serve as pageboy and bridesmaid.
The update confirmed that Mr Brooksbank's brother, Thomas, will be his best man, while the bride-to-be will have her sister, Princess Beatrice, as the maid of honour. Accompanying the news were several sweet throwback photos of the couple and their siblings to mark the special occasion.
Cara was rumoured to be at Eugenie's 25th birthday party at Royal Lodge, and the Princess joined the sisters to celebrate Poppy's 32nd birthday back in May.More news: 10 things to know about Aussies and mental health
The other bridesmaids will be Peter and Autumn Phillips' daughters Savannah and Isla, and Zara Tindall's spirited four-year-old Mia, along with Maud Windsor, who is Eugenie's goddaughter and the daughter of Lord Frederick Windsor and his actress wife Sophie Winkleman.
"I know it seems odd that Camilla's missing Eugenie's wedding but it doesn't indicate any malice or ill-feeling". Some even reminisce about the sunny afternoon in 2011 when Prince William married Kate Middleton, whose grace stirred memories of his mother, the late Princess Diana.
It's never ending for the royals!
Like Meghan and Harry, the newlyweds will then undertake a short carriage procession through part of Windsor High Street.
There are rumours George Clooney and his wife Amal will be in Windsor once again this October as the A-list actor has a connection to the groom.