A party fit for a princess: Sarah, Duchess of York reveals all about her granddaughter Sienna’s unicorn-themed birthday bash

It came as no surprise, therefore, that when Sienna Mapelli Mozzi was born at Chelsea and Westminster Hospital the following year, she was given a particularly poignant middle name. Beatrice and Edoardo dubbed their first-born Elizabeth – a sweet nod to their daughter’s late great-grandmother. Her first name, meanwhile, was reportedly inspired by the red hair that Beatrice and her mother, Duchess of York, share.

Beatrice and Edoardo are famously private when it comes to family life, and…