During a walkabout outside the Warrant Officers and Sergeants' Mess, Kate chatted with well-wishers - and revealed that 7-month-old son Prince Louis is already working on his royal wave. While they were there, Prince William made fun of Middleton's outfit when he noticed that her ensemble matched the decor.
The rest of the royal family have also been getting into the Christmas spirit recently as the public were given an exclusive glimpse behind the doors of Buckingham Palace as three lavish Christmas trees were erected in the Marble Hall.
The Duchess of Sussex, who is pregnant, will be under intense scrutiny this year as the Royal Family attend the traditional Christmas Day church service; with observers looking for the slightest hint of friction.
And so do your families, some of whom we had the chance to meet yesterday at a party at Kensington Palace.
The duchess greets children in Cyprus
Speaking in front of a crowd of RAF personnel and soldiers from the 2 Mercian Regiment, Prince William said: "As we approach Christmas, Catherine and I feel strongly that praise for your work and recognition of your sacrifices is exactly what is due to you all". "As someone whose husband has served, I know how hard it feels when a loved one leaves to do the job they trained for", she said.
The night before, the Duke and Duchess of Cambridge hosted a celebration for the families of servicemen and women who'd spend the holidays serving overseas.
"When William served in the Falklands or went search and rescue, I remember how it felt".
"The absence of people you love must be especially hard at this time of year", the royal continued.
Now that's what you'd call a truly royal mail service.
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