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What IS Sienna Miller's secret? Incredible renaissance for actress, 42, as she looks better than ever just four months after giving birth - after crediting yoga and Marmite as the secret to her age-defying looks

The fashionista, 42, showcased her incredible figure in a £3,900 gown at a star-studded birthday party, just four months after giving birth to her second child.

Princess Olympia of Greece and Lady Mary Charteris, danced with members of the Guinness family, who downed Iron Bru during a festival-themed party in the day before switching to more sophisticated dirty martinis with their black tie attire in the evening. Rare snaps from inside the Mount Stuart House were also shared, including a grand staircase, ornate ceiling pattern and even the somewhat old-fashioned toilet. Despite her party girl antics, Lola is sober, having sought help for 'unhealthy coping mechanisms' following the suicide of her boyfriend Kai Schachter and the accidental overdose of her best friend Ila Scheckter.

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Lady Lola Bute

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