Found it! As printed in The Sun on November 17, 2007:
"THE Queen and Duke of Edinburgh pose with their family as they kick off their diamond wedding celebrations last night.
This snap was taken at a bash thrown by Prince Charles at Clarence House for 25 Royals — plus Peter Phillips’ fiancee Autumn Kelly.
They feasted on lobster mousse, Sandringham partridge and ice-cream cake with Highgrove berries.
The flowers on the table were white cattleya orchids — the same as on the Queen’s bouquet on November 20, 1947.
Today the Queen and Duke will attend a thanksgiving service at Westminster Abbey.
Back row: Daniel Chatto, Lady Sarah Chatto, Prince Michael of Kent, Princess Michael of Kent, Duke of Kent, Princess Alexandra, Viscount Linley, Viscountess Linley.
Middle row: Vice Admiral Timothy Laurence, Peter Phillips, Princess Royal, Autumn Kelly, Zara Phillips, Princess Beatrice, Duke of York, Princess Eugenie, Earl of Wessex, Duchess of Gloucester, Countess of Wessex, Duke of Gloucester.
Front row: Prince William, Prince of Wales, Queen, Duke of Edinburgh, Duchess of Cornwall, Prince Harry"