Princess Diana was “ashamed” of her bulimia. The tragic royal, who was killed aged 36 in a 1997 Paris car smash, was stricken with the eating disorder just before she got married to Prince Charles, and continued to suffer with it as their marriage collapsed. Her long-time dance teacher Anne Allan said Diana asked to cancel her dance lessons before revealing she had bulimia in her recently released autobiography ‘Dancing with Diana’. She said Diana’s lady-in-waiting Anne Beckwith-Smith called to say the princess may want to stop her lessons, but when she asked Diana the royal said she was “anno…