They've been by each other’s side all their lives – holding their mother’s hands in matching mini denim dresses as tiny tots and sticking close to each other at royal galas, weddings, horseraces and parties as they grew up.
So when princesses Beatrice and Eugenie became mothers within seven months of each other, it was easy to imagine their delight.
They’d be raising their babies together – Beatrice’s new daughter a just-younger cousin to Eugenie’s son, August.