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King Charles III underwent a successful surgery after being hospitalized for prostate treatment.

"His Majesty is doing quite well," a royal source told Fox News Digital. 

Fox News Digital has learned that Queen Camilla left the hospital after his procedure, and everything went as expected.

Camilla was seen leaving the London hospital on Friday evening with a smile. She donned a navy-blue long-sleeve dress that was tied in the front. 

Queen Camilla

Queen Camilla departs The London Clinic in central London where King Charles is being treated for an enlarged prostate. (Getty Images)

It is not immediately clear how long King Charles will remain in the hospital.

The London Clinic private hospital is the same facility where Charles' daughter-in-law, Kate Middleton, the Princess of Wales, was admitted for planned abdominal surgery last week.

KATE MIDDLETON HOSPITALIZED FOR SURGERY, EXPECTED TO STAY FOR UP TO 2 WEEKS

King Charles sitting and smiling at the camera

King Charles is "doing quite well" after prostate treatment, according to a royal source. (Hugo Burnand/Buckingham Palace via Getty Images)

According to the BBC, the king visited Middleton in the hospital on Friday morning before his own scheduled treatment.

Last week, Buckingham Palace revealed that His Majesty was seeking treatment for an enlarged prostate. It noted that the 75-year-old’s public engagements "will be postponed for a short period of recuperation."

WATCH: QUEEN CAMILLA GIVES HEALTH UPDATE ON KING CHARLES AFTER ENLARGED PROSTATE DIAGNOSIS

While Charles’ engagements have been delayed due to his medical procedure, Camilla, 76, continued to carry on with her royal duties. Camilla was spotted arriving at the Aberdeen Art Gallery in Scotland on Jan. 18. Before heading into the event, the royal greeted the crowd.

"Good morning, it was quite a frosty journey. Sorry, we're a bit late, I'm afraid," she said with a smile.

When asked, "How is His Majesty?" Queen Camilla simply replied at the time, "He's fine, thank you very much. Looking forward to getting back to work."

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King Charles’ health news came just after the palace revealed that Middleton had been hospitalized for a medical procedure.

Last week, Kensington Palace announced that the Princess of Wales, who turned 42 earlier this month, underwent a "planned abdominal surgery" at The London Clinic. She is postponing all public duties until after Easter.

PRINCE WILLIAM VISITS KATE MIDDLETON IN HOSPITAL FOLLOWING SURGERY, EXPECTED TO POSTPONE ROYAL DUTIES

prince william, kate middleton

Prince William visits Kate Middleton in the hospital following surgery. (Getty Images)

Middleton and Charles have received a tremendous amount of support as Prince William and Queen Camilla have stood by their sides. 

The Prince of Wales visited his wife at the hospital, and has reportedly been taking on additional parental responsibilities as she recovers from abdominal surgery. 

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Prince William was photographed driving as he left the private London Clinic last week.

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