For many 90-year-olds, a good night out might involve a game of whist or dominoes at the local pensioners' club. But then again, most 90-year-olds are not the Duke of Edinburgh.
Shooting the breeze with the Hollywood actresses Gwyneth Paltrow and Cameron Diaz, the Duke looked every inch the lounge lizard at a drinks reception in Mayfair.
He was enjoying himself so much at The Arts Club that he stayed late into the night to listen to an impromptu concert by Paltrow, who joked: Don't tell the Queen.
The Duke, who is patron of the 148-year-old members-only club, was the guest of honour at an official reopening party following a major refurbishment.