Fans were fairly quick to notice there was no mention of Archie, Meghan Markle and Prince Harry’s child, in the post.
One Twitter user said: “I wish Archie was home to help his cousins make a card, but I digress.”
Other said: And none from Archie?”
Of course, the Queen has many, many great-grandchildren who were also not mentioned in the post.
These include the children of Zara Tindall, Mia Grace and Lena.
There are also Peter Phillip’s children with former wife Autumn, Savannah and Isla.