Princess Eugenie and Jack Brooksbank have been dating for seven years and announced their engagement in January.
In fact, they've had plenty of practice at the roles, as they were also page boy and bridesmaid for their aunt Pippa Middleton's wedding to James Matthews in May 2017.
The other bridesmaids will be - Savannah Philips, seven the daughter of Autumn and Peter Phillips; Isla Philips, six, the youngest of the Phillips' daughters; Mia Tindall, four, the daughter of Zara Tindall and Mike Tindall; Maud Windsor, five and goddaughter of Princess Eugenie, and daughter of Lady Frederick Windsor and Lord Frederick Windsor.
Prince George and Princess Charlotte will act as Princess Eugenie's page boy and bridesmaid this Friday. The pair have been photographed together on multiple royal occasions, including on the balcony of Buckingham Palace for Trooping of the Colour, as well as sharing a carriage for the Royal Ascot, where they were joined by Prince Charles and Princess Beatrice. 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.
Following in the footsteps of the Duke and Duchess of Sussex, Eugenie and Jack have invited 1,200 people from across the United Kingdom to the grounds of Windsor Castle to share the experience of their special day.
With a full day of events, there is plenty to anticipate as yet another member of the royal family gets ready to kick off a lifetime of love.