Kate, 42, has been staying at the private London Clinic, based in Marylebone, after undergoing abdominal surgery on 16 January.
Prince William - who has since cut down his work commitments - was last seen in public on 18 January, when he drove himself to the London-based hospital.
It comes as no surprise that the Middletons are helping where they can. The doting grandparents - who are very hands-on - live in Bucklebury village about 40 minutes' drive away from the Wales' family home, Adelaide Cottage.
Since Kate's admission to hospital last week, Prince William has been looking after his children at their home in Windsor. The couple are striving to make sure things are as normal as possible.
William, 41, will no doubt also have the support of the children's nanny, Maria Teresa Turrion Borrallo, who studied at the prestigious Norland College in Bath, and has worked for the royals since 2014 when George was eight months old.
Last week, Buckingham Palace confirmed that the future Queen is expected to remain in hospital for up to 14 days before returning home to continue her recovery.
She is not expected to carry out official engagements until after Easter, with the Prince of Wales clearing his diary of official duties for the time being.
The Palace refused to confirm what Kate was being treated for but confirmed the condition was non-cancerous. In a statement, the palace added: "The Princess of Wales appreciates the interest this statement will generate.
"She hopes that the public will understand her desire to maintain as much normality for her children as possible; and her wish that her personal medical information remains private.
"Kensington Palace will, therefore, only provide updates on Her Royal Highness' progress when there is significant new information to share.
"The Princess of Wales wishes to apologise to all those concerned for the fact that she has to postpone her upcoming engagements. She looks forward to reinstating as many as possible, as soon as possible."
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