Carrie Johnson chose a royal favourite for tonight's concert - Platinum Party at the Palace - a floral frock from The Vampire's Wife. Worn by Princess Beatrice, as well as Kate Middleton, the label has positioned itself as a winner for after-hours events that require polished pizazz. The exact dress is still available to buy on the brand's website or £795, but it's much more likely that Johnson, a famous fan of renting, borrowed the dress instead of buying it.
One of her favoured platforms, My Wardrobe HQ, has the dress in its collection - and it's available to borrow from £14 per day (although it's currently rented; a sign, perhaps, that we've found its temporary home). Johnson rented her wedding dress from the platform, and has continued to champion the more mindful approach to wearing something 'new' throughout her time at 10 Downing Street.