Princess Williams visited his wife, Katherine, the Princess of Wales in the hospital after she underwent abdominal surgery.
Catherine has spent her second night in hospital after successful, planned abdominal surgery at the London Clinic private hospital.
Her husband Prince William was seen driving away from the back entrance of the hospital in central London where she is being treated.
The King had also announced that he was going to undergo surgery for prostate enlargement.
On a visit to Aberdeen on Thursday morning, Queen Camilla was asked about the King and replied: “He’s fine, thank you very much. Looking forward to getting back to work.”
Rumors about Princess Kate’s surgery are presumed to be cancer-related since the medical procedure was planned.
The latest updates on her condition have been reassuring, suggesting a good recovery.
The princess had last been seen in public at Christmas, when she had appeared well, after a busy series of engagements, including her carol concert from Westminster Abbey.
Prince William will be spending more time with his wife, while she recovers, which is expected to mean changes to his planned schedule.