Lady Iris Cholmondeley, two

The 7th Marquess of Cholmondeley and his super-glamorous wife, Rose ( above, with Kate), are Norfolk friends of the Cambridges: their Palladian pile, Houghton Hall, is a few miles from the Sandringham Estate (and makes the Cambridges’ Anmer Hall look like a cottage). Lady Iris will introduce Baby Cambridge to the Norfolk gang and her two older brothers will make sure there’s no funny business.