A few hours before the Spencer sisters arrive to pose for their first joint magazine cover, they are luminous on the red carpet at the British Fashion Awards; dazzling with old-school aplomb and new-world glow, scions of the British aristocracy raised in the South African sun. Kitty is splendid in strapless gold, and the twins’ black off-the-shoulder dresses are inevitably (and globally) compared to their aunt Princess Diana ’s ‘revenge’ dress. The trio eclipse all the other guests with their blonde elegance and can-do attitude – they are bougie bombshells with an irresistible back story. A few weeks before, they attended an awards ceremony for Centrepoint, the homeless charity, all in silvery blue. (The twins in satin and Kitty in a Dolce & Gabbana dress depicting a Venetian scene,

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