A body language expert has identified three tell tale signs King Charles is feeling tense with his youngest son back in the UK.
The monarch and Queen Camilla are on a three-day trip to Germany as part of their first state visit after plans to go to France were scrapped over safety fears.
On Tuesday the pair were given a huge ceremonial welcome with military honours at Berlin's iconic Brandenburg Gate.
Despite smiling and talking to people who had come out to catch a glimpse of the monarch, he showed several signs of tension, according to expert Judi James, including impatience, anxiety rituals and baring his lower teeth.
It comes as Prince Harry is in London for a privacy hearing.
Judi told Sun Online: “Like his previous appearance at the Commonwealth Service in London he appeared slightly impatient at times.
"Charles patted the pocket of his coat several times, which is a common trait of his self-touch anxiety rituals.
"At one point he was seen jutting his lower jaw and baring the teeth, which did suggest tension and a build-up of pressure."
It comes as the King’s German hosts on his first state visit abroad as monarch took no chances of annoying him with iffy pens.
He was memorably plagued by a series of unfortunate pen blunders in the early days of his reign.
It was reported the pen the monarch used while signing the guest book during a visit to presidential palace Schloss Bellevue was "repeatedly checked" ahead of Charles' arrival.
Kai Baldow, head of protocol in the German president’s office, told the Süddeutsche Zeitung newspaper of the lengths they had gone to in checking the pen and added: "Our pen has never failed."
And it seems their preparation paid off as the guest book signing went off without a hitch.
His Majesty went viral due to several clips in the days after he came to the throne that showed him losing his cool when it has come to signing several documents.
The first came at the meeting of the Accession Council - where he was proclaimed King - when he grimaced after a pen tray got in the way of him signing a document and he beckoned an aide to move it.
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The second came on a trip to Northern Ireland when a leaky pen left him agitated and he said: " "I can't bear this b****y thing ... every stinking time!"
Charles and Camilla's welcome reception at Schloss Bellevue came after they visited the Brandenburg Gate - the first time the landmark has been used to welcome any visiting head of state.
An earlier trip to France was called off over fears for the royals’ safety amid ongoing protests.
