By Chiara Fiorillo Prince Harry has been warned that he cannot “stoop lower” than taking a selfie with a “very distant cousin” after the pair met at the Living Legends of Aviation award event on Friday night. The Duke of Sussex attended the ceremony at the Beverly Hilton Hotel in Beverly Hills, Los Angeles, where his work as a British Army veteran and pilot was recognised. The 39-year-old completed two tours of Afghanistan as a forward air controller and an Apache helicopter pilot, having flown countless training missions in the UK, US and Australia. He served for 10 years in the military, ris…