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Beatrice, 25, wore a striking blue coat and mustard coloured hat as she walked hand-in-hand with boyfriend Dave while Cressida wrapped up against the cold in a black coat and tights, sporting a cream floral garland around her head.
The group were seen walking to the ceremony, which took place in the Wren Chapel at the Royal Hospital Chelsea, where Zoe and Jake, whose father is the Queen's racing manager John Warren, tied the knot.
Jake, 27, was one of Diana, Princess of Wales’s 17 godchildren and is known to be a close friend of the royals, including Prince William and Prince Harry.
Dressed in traditional tails, with a cream waistcoat and a bright blue tie, the excited groom beamed as he walked to meet his bride, who chose an elegant wedding gown complete with a lace back, collar and sleeves.
Similar to her new father-in-law, Zoe is keen on horseracing and is often seen with Zara Phillips and the Duke of Edinburgh at Goodwood and Epsom racecourse.
Also in attendance at Zoe and Jake's nuptials was Prince William's close friend Guy Pelly, who has recently become engaged to his American girlfriend, Lizzy Wilson.
Lizzy's glittering engagement ring was visible as she walked arm-in-arm with her fiancé, dressed in a chic black coat, which she accessorised with a green fascinator, a gold clutch bag and red lipstick and nail polish.