The bride will be dressed by Giles Deacon or Emilia Wickstead or Erdem, reports have speculated, and will carry hydrangeas or peonies in a red, white and blue theme – or alternatively, since that sounds highly unlikely, she will not.
The Middleton-Matthews love affair did not begin in the public eye, but has always been attended by luxury.
The couple are said to have met in 2007, when the Middletons holidayed at Eden Rock, the Matthews family’s luxurious home in St Barths, and they dated briefly in 2012, rekindling their romance in 2015.
The groom himself is said to have a net worth of £2.3bn after co-founding a capital management group.
Besides Prince Harry and Markle, Spencer Matthews, the groom’s reality TV star brother, will be there, but has apparently been warned not to make rude jokes in front of the royals.