The daughters of the Duchess of York, Princessess Eugenie, 35, and Beatrice, 36, are known to share a close bond with Sarah and call themselves the 'tripod'.
In the world of royal fashion, trends may come and go, but one style principle has proven itself a steadfast favourite among the Firm's most fashion-savvy women, the monochromatic wardrobe.
Fergie joined ex Andrew and daughters Eugenie, 35, and Beatrice, 36, for the Easter Matins service in Berkshire on Sunday - and was spotted offering a warm hug to the Duchess of Edinburgh.
It was reported in March that Montecito-based Prince Harry has distanced himself from his close cousin and 'ally' Princess Eugenie after their relationship 'soured'.
Edoardo Mapelli Mozzi shared a sweet snap of his wife Princess Beatrice to his Instagram on Monday as the couple enjoyed the FI Grand Prix in Bahrain alongside Beatrice's sister Princess Eugenie.