The former TOWIE star was demure in a fitted skirt and coat combo by designer Jean-Pierre Braganza for the Shop Wear Care event at the posh Claridge's Hotel on Monday (16 November).
Lucy finished her chic look with a crisp white shirt by London-based luxury shirt label La Belle Epoque and lace-up snakeskin print shoes from Office.
Ahead of arriving at the party, fitness guru Lucy had told fans: "I love London at Christmas!!! At @claridgeshotel tonight for#shopwearcare raising money for@greatormondst .. Lovely event & let's hope they raised lots of money for a fantastic cause x."
Shop Wear Care is a one-night shopping extravaganza that raises money for Great Ormond Street Hospital's Children's Charity. Guests shop discounted clothes, accessories and beauty products donated by luxury brands, with 100 per cent of proceeds going to the charity.
Lucy Mecklenburgh - life after TOWIE: