“But the Queen’s daughter is a woman who has often appeared to keep a polite and sometimes frosty-looking distance from some of the royal wives and this signal of what looked like easy-going friendship and shared fun with Camilla, who can often appear tense and rather anxious in public, did seem like a first.

“The outfit ‘clash’ has happened before with both women wearing identical colours and then mirroring one another’s body language as they stood in public together.”

Not only do the royals appear close, their body language suggests they could share a very personal bond, like a mother and daughter, Judi explained.

She said: “Anne has never shown signs of being particularly close to her brother Charles, but she does seem to share a natural friendship that could even border on a daughter/mother bond with Camilla.”