Nicky Hilton and her soon-to-be husband, James Rothschild, attended a prewedding dinner in London on Thursday, with friends and family gathering to celebrate the couple. Nicky wore a short, cream-colored dress for the occasion, posing for pictures on the steps of Spencer House in St. James's. Her sister, Paris, did the same, stopping to smile for the cameras. Nicky and James are set to tie the knot in a lavish wedding on Friday at Kensington Palace, the home of Prince William and Kate Middleton. Keep reading for more pictures from the night, then check out more celebrities' Summer weddings.