Young girls learn deportment by balancing books on their heads as they take part in a 'Princess Prep' class training afternoon in London April 2, 2011. A dozen girls aged 7 to 11 learned skills needed by princesses, during an afternoon course on poise, grooming tips, tea party etiquette and how to curtsey. Princess Prep is based in the U.S. and is marketing 7 day courses for girls to travel to Britain to study such subjects as the Royal family, etiquette and horse riding. REUTERS/Luke MacGregor (BRITAIN - Tags: ENTERTAINMENT ROYALS SOCIETY)