 The marriage ceremony was set for 2 May 1816 . On the wedding day , huge crowds filled London ; the wedding participants had great difficulties in travelling . At nine o 'clock in the evening in the Crimson Drawing Room at Carlton House , with Leopold dressing for the first time as a British General ( the Prince Regent wore the uniform of a Field Marshal ) , the couple were married . Charlotte 's wedding dress cost over ₤ 10 @,@ 000 . The only mishap was during the ceremony , when Charlotte was heard to giggle when the impoverished Leopold promised to endow her with all his worldly goods . 
