Lady Kitty Spencer shares a holiday snap from New York with her rarely seen daughter, Athena

Lady Kitty Spencer is one of the most well-travelled members of the British aristocracy. Whether the niece of Princess Diana is holidaying in the Hamptons with her partner, Michael Lewis, or jetting off to Cannes Film Festival with her sisters, Lady Amelia and Lady Eliza Spencer, the social set doesn’t get more jetsetting. But on a recent holiday to New York, Tatler cover star Lady…