QUEEN Camilla has been spotted smiling as she arrives at The London Clinic today.
King Charles has been at the hospital for three days since his arrival for enlarged prostate treatment on Friday.
The Monarch's beloved wife Camilla, 76, was seen in good spirits as she arrived in a black Audi car today.
The Queen left The London Clinic at 3.10pm in the same car and sat in the front passenger seat.
A small group of Royal fans gathered on the pavement as she left the hospital to send their messages of support.
It is the fourth time the Queen has visited after Charles was admitted for 'corrective' surgery.
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Camilla appeared previously told well-wishers "he's fine, thank you" when she first left the premises at 3.10pm on Friday.
The Queen visited for a second time for around an hour and a half before leaving just before 8pm.
It is understood she told people inside the hospital at the time that the King was "doing well" after the procedure.
King Charles, who acceded to throne only 16 months ago, has been absent from royal duties while awaiting the treatment and is expected to miss upcoming events while he recovers.
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A statement last week said: "In common with thousands of men each year, The King has sought treatment for an enlarged prostate.
"His Majesty's condition is benign and he will attend hospital next week for a corrective procedure.
"The King’s public engagements will be postponed for a short period of recuperation."
It is understood His Majesty was diagnosed with the benign condition on January 17 while staying at Birkhall, Aberdeenshire, after going for a check-up because he was experiencing symptoms.
Prime Minister Rishi Sunak wished Charles the "very best" for his treatment and a "speedy recovery" afterwards, a Downing Street spokeswoman said.
The King is also understood to have visited Kate ahead of his own treatment, sources said.
It emerged Charles wished to be treated at the same hospital to avoid a double security bill.
If the King had chosen to have surgery at the Royal Family's favoured hospital – King Edward VII's – a second bodyguard detail may have costed up to £14,000 more.
Now, the King and Princess Kate were both said to be "doing well" as they recover from operations at The London Clinic in Marylebone.
The Royal mum-of-three, 42, underwent planned abdominal surgery on January 16 and is said to be taking a step back from public duties until March.
Kate is expected to spend between 10 and 14 days recovering in hospital before going home to Adelaide Cottage in Windsor.
Sources claimed at the weekend that the Princess' commitment to her royal duties will see her get back into work as soon as she can.
She is said to have plans to work from bed once she arrives home from her surgery.
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Meanwhile husband Prince William, 41, has visited her every day at the clinic in Marylebone, central London.
Children Prince George, Princess Charlotte and Prince Louis have not been to see their mum to keep life "normal", as they continued going to school.
ROYAL OPERATIONS: How the health scares facing Charles & Kate unfolded
With King Charles and the Princess of Wales undergoing surgery at the same hospital, here is a timeline of the health troubles facing the two royals.
Tuesday, January 16: Kate, 42, is secretly admitted to the London Clinic and undergoes abdominal surgery.
Wednesday, January 17: Kensington Palace announces the princess' operation and says she will remain in the private hospital for 10-14 days.
Over an hour later, Buckingham Palace announces the King, 75, is to have treatment for a benign enlarged prostate and will be admitted to hospital in a few days.
Thursday, January 18: Prince William spends time at his wife's bedside, driving himself away from the back entrance during the low-key, private visit.
The Queen says the King is "fine" and "looking forward to getting back to work" during a visit to the Aberdeen Art Gallery
Friday, January 19: The King flies back from Scotland with the Queen and heads to his Sandringham estate in Norfolk to rest ahead of the procedure.
Monday, January 22: The Queen tells 86-year-old well-wisher Jessie Jackson that the King is "fine", and thanks her for asking, while she carries out engagements in Swindon.
Camilla urges the King to take it easy. An insider told The Sun: "The Queen has told him he needs to slow down a bit."
Thursday, January 25: The King arrives back in London from Sandringham ready for his treatment.
Friday, January 26: The King is admitted to the London Clinic for treatment for an enlarged prostate and also visits the Princess of Wales, who is recovering in the same hospital.