It is thought that the 93-year-old monarch may have treated herself to a pot of tea,just as Buckingham Palace released a highly personal statement.
While the pair have not said where in North America they plan to reside,many observers point to Canada as a logical choice.
Young royals have bucked tradition and chosen to share environmentally friendly online greetings,rather than printed Christmas cards.
Meghan Markle and Prince Harry‘s son,born on May 6,had his christening on Saturday at Queen Elizabeth’s private chapel at Windsor Castle.
In at least one respect,Archie Mountbatten-Windsor will be welcomed in a traditional royal manner.
The Duke and Duchess of Sussex have shared a new photo of their six-week-old son Archie to celebrate Father's Day in the UK and the US.
The couple also quoted from the poem Lands by US poet Nayyirah Waheed:"My mother was my first country;The first place I ever lived."
The prince stepped out in a jumper which read"I am daddy"for his first workday since Master Archie's birth.
The tweet was seen as a racist reference to baby Archie's heritage,and the kind of comment that Prince Harry lashed out at early in his relationship with Meghan Markle.
Harry and Meghan want to'keep things simple'for the time being,so little Archie won't be His Royal Highness until he's taller.
About 250 babies are born worldwide every minute of every hour of every day of week of every month. But this one got lucky.