Prince Louis’ birthday is upon us, and as the youngest of three, there’s a strong chance that he’ll be thoroughly spoiled, says This Morning’s psychologist Emma Kenny.The cheeky royal celebrates his milestone on St George’s Day, April 23, most likely in the company of his parents the Duke and Duchess of Cambridge and his older siblings Prince George, seven and Princess Charlotte, five. And according to Emma, he’ll be very accustomed to being the centre of it all.