Sienna Miller's renaissance! Actress, 42, wows fans as she showcases her incredible post-partum figure just four months on from daughter's 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.

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