The First Lady of the United States, Michelle Obama, looked effortlessly stylish as the Obamas spent two days in London, as part of a six-day Europe trip. The First Lady scored a fashion win in a stunning black off-the-shoulder dress by American designer Ralph Lauren at the black-tie dinner. Michelle Obama also showed off a selection of jewels, including a Tom Binns cuff and necklace.US President Barack Obama and his wife Michelle Obama hosted a dinner for Britain's Queen Elizabeth II at Winfield House - the residence of the Ambassador of the United States of America - in Regent's Park.