In what we can safely say is the most sophisticated play on the slit-dress trend, Kate Middleton lit up Claridge’s hotel in London for the Thirty Club dinner last night. If like us you were caught up in the world of Met Gala fashion, then you might have missed the Duchess of Cambridge's showstopping arrival in the creamy Roland Mouret gown from Fall '09. Flashing just a little leg, Kate played off the gown's skin-revealing slit with ease and confidence, and accessorized its creamy white hue with a touch of sparkle on her shimmering clutch and metallic Jimmy Choos. It may just be one of our favorite looks from the Duchess to date. Click on to see her utterly chic arrival from every angle.