KING Charles left royal fans concerned as he appeared to sway backwards during this afternoon's ceremony - but he's fine moments later.
The late Queen's son, 73, looked emotional standing with other senior royals following the sombre procession of the coffin from Buckingham Palace.
There were tears and raw emotion from some of the devastated family members as they joined in prayers for Her Majesty.
As the camera focused on Charles, some royal fans believed that he appeared to be swaying on his feet.
The King seems slightly unsteady for a few seconds but footage cut away and he had recovered when the cameras were next on him.
The clip was quickly spotted by eagle-eyed viewers.
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And some believed he was swaying "with exhaustion".
"My heart goes out to all the children and grandchildren of our late Queen Elizabeth II," one royal follower wrote on Twitter, sharing the footage.
"Especially to King Charles III - he looked to me to sway with exhaustion more than once.
"His schedule since his mother’s passing has been gruelling - both physically (his age) & emotionally."
Another wrote: "Feel for the Royal Family, King Charles and Princess Anne looked exhausted."
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While a third said they thought Charles "was going to sink down at one point".
It comes after Charles was caught getting irritated at the position of pen pots on his desk as he signed the documents confirming him as king at St James' Palace.
He was spotted gesturing frantically at an aide to remove the ink pots from his desk while he wrote his signature.
The new sovereign also appeared to become exasperated on Tuesday as he had to deal with a leaky pen during a visit to Northern Ireland's Hillsborough Castle.
"Oh God I hate this," he said, gesturing at the pen as he handed it to his wife Camilla, Queen Consort.
A medical expert has laid out the importance of the new king finding time to grieve and rest as he faces a gruelling schedule.
It comes as...
- Princes William and Harry stood shoulder to shoulder in the emotional walk from Buckingham Palace
- Meghan Markle followed the procession in a car with Sophie while Princess Kate and Camilla were driven to Westminster Hall
- Harry and Andrew wore suits after being banned from wearing military uniforms
- No 10 revealed an update on calls for an annual bank holiday after a petition gathered thousands of signatures
Dr Gareth Nye, a lecturer in physiology at the University of Chester, told that an unrelenting travel schedule can have "physiological consequences," most notably in "those people over the age of 60".
He added: "Of course, this is not only a man who has a hectic schedule, this is a man who is going through immense grief."
The health expert went on: "I am sure both the King and Queen Consort will be advised to take regular rests throughout the coming days and weeks whilst maintaining a good personal schedule in terms of diet, with all schedules planned in respect of this."
King Charles was united in grief with his family today as the Queen was taken to lie in state following a poignant procession.
The grieving Monarch looked sombre as he left Buckingham Palace for Westminster Hall for Her Majesty's final public duty.
A hush fell among the tens of thousands of mourners who gathered in the capital to pay their respects to Her Majesty.
The silence was punctuated only by a single gun round sounding along with a toll from Big Ben each minute to honour the Queen.
Even flights from Heathrow were grounded to allow for ultimate quiet on the 38-minute journey.
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King Charles looked mournful as he was joined by Her Majesty's other children, Princess Anne, Prince Andrew and Prince Edward in a poignant display of respect.
Her Majesty's coffin was draped with the Royal Standard with the Imperial State Crown placed on a velvet cushion.
A floral wreath included white roses, dahlias and a foliage from the gardens at Balmoral and Windsor.
The Queen was carried on a gun carriage of The King’s Troop Royal Horse Artillery in a nod to her love for the military.
She was then saluted by her Grenadier Guards as she was placed on the catafalque in Westminster Hall to lie in state until Monday morning.
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A 20-minute service took place led by the Archbishop of Canterbury, who read the opening prayer as the grave-looking royals took their places in the vast hall.
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Princesses Eugenie and Beatrice and their husbands, Zara and Mike Tindall, Lady Louise Windsor Viscount Severn, Lord Freddie Windsor and Princess Michael of Kent were among those attending.