The 84-year-old Great British Bake Off judge rocked a black skintight leather dress with latex evening gloves and red contrast stitching.
Her look was paired with smokey black eye make-up, a bright red lip and spiky hair.
Before the Vin + Omi show on Friday night, designer Vin told PA Media the goal was to “sex her up”.
The cook, who is known for her colourful ensembles, bold necklaces and glasses, lives near Moreton-in-Marsh, near the Oxfordshire border.
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She previously lived at the 17th century Georgian manor house Chastleton Glebe for nearly 50 years.
Dame Prue Leith in a leather punk ensemble at London Fashion Week (Image: Ian West/PA) In an interview with the Oxford Mail she told how she enjoys riding on the back of her husband John Playfair’s Harley-Davidson as they pub crawl around the Cotswolds.
The chef had teased her catwalk appearance at London Fashion Week on Instagram, telling her 329,000 followers: ‘I’ll try anything once… or twice’ and sharing videos taken by friends of her walking the runway.
Vin + Omi’s designs are focused on sustainability and the catwalk featured fabrics made from nettles, chestnut, butterbur, cow parsley, mushroom, recycled plastic and wood chippings from the King’s Sandringham estate.
The design duo, who are nomadic but predominantly based in Norwich, have been collaborating with the King to develop sustainable fabrics since 2019.