However, one royal expert has claimed that an "extremely significant" recent move made by the couple might signal there is still potential for things to thaw - which would have a big impact on their children Prince Archie, five, and Princess Lilibet ...

Meghan Markle has made a sweet nod to Prince Archie, just as the Duchess of Sussex ended her professional separation from Prince Harry. The mother-of-two and her husband, the Duke of Sussex, have made their first joint appearance as a couple since their Colombia tour in August.

So why hasn't Harry returned the favor with a 76th birthday tribute to his father? Well, for starters, Prince Harry and Meghan Markle no longer have a joint social media account, or individual pages for that matter.