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Matching his wife, Robbie opted for a black coat with a fur collar as her enjoyed lunch in the brisk London spring.
Lady Mary modelled for the likes of Tatler, Vanity Fair, Vogue and Love, and is now best known as a DJ and member of electronic rock band The Big Pink.
The singer and model, 33, showed off her pink hair as she wrapped up warm for a spot of al fresco dining at celeb haunt Scott's in Mayfair, west London.
Looking relaxed and make-up free, the DJ daughter of James Charteris, Earl of Wemyss and March and Catherine Ingrid Guinness, of the Guinness dynasty, sported a fluffy black coat over a multicoloured shirt.