Eugenie and Jack will marry at St George's Chapel at Windsor Castle on Friday 12 October.
Savannah and Isla are the two daughters of Mrs Autumn Phillips and Mr Peter Phillips. 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.
The only non-royal bridesmaid will be Theodora Williams - the six-year-old daughter of Robbie Williams and Ayda Field.
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.
Eugenie, 28, younger daughter of Queen Elizabeth's third child Prince Andrew and his ex-wife Sarah Ferguson, the Duchess of York, will tie the knot with boyfriend Jack Brooksbank, 32, at the monarch's Windsor home.
Unlike her cousins Prince William, and Prince Harry, Eugenie has never been a "working royal".
Camilla is scheduled to visit a school in Scotland on the day of Princess Eugenie's wedding, according to reports.
Mia is the 4-year-old daughter of Zara and Mike Tindall (the daughter and son-in-law of Princess Anne, respectively).
As the wedding nears, the couple and their families released recent pictures of the loved-up couple to offer royal fans an insight into their love story.
Princess Eugenie and Mr Brooksbank met at the Swiss resort of Verbier where Eugenie was on a family vacation celebrating her father's 50th birthday.
It has already been announced that 1,200 members of the public have been invited into the grounds of Windsor Castle for the wedding.
The children of the Early and Countess of Wessex, 14-year-old Lady Louise Mountbatten-Windsor, and 10-year-old Viscount Severn, will take on the role of special attendants.