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Kate Middleton is self-isolating after coming into contact with someone with Covid, Kensington Palace said.

Her Royal Highness is not experiencing any symptoms, but is following all relevant government guidelines and is self-isolating at home.

The Duchess of Cambridge has been forced to isolate and pull out of two events today to celebrate NHS heroes after coming into contact with someone who has tested positive.

Kate, who has since tested negative, was alerted on Friday afternoon and began isolating.

It means she can not attend a service of thanksgiving at St Paul's cathedral this morning or a Big Tea garden party at Buckingham Palace this afternoon she was also hosting together with William.

It comes days after she attended Wimbledon on Friday
(Image: Getty)

The Duchess, who is 39, has received both vaccinations and last week had taken two lateral flow tests before watching England beat Germany last Tuesday at Wembley stadium and attending Wimbledon on Friday.

Both tests were negative.

Kate will now have to miss England's crucial semi-final at Wembley on Wednesday night.

On her visit to Wimbledon on Friday the Duchess helped to prepare strawberry desserts in the kitchens with the All England Lawn Tennis Club Executive Chef Adam Fargin.

Prince William arrived at St Paul’s Cathedral alone while Kate stays home
(Image: Ian Vogler / Daily Mirror)

The masked duchess helped decorate tennis ball macaroons and was shown how to hull Wimbledon's iconic strawberries as hungry fans chomp through around two million every championship.

A palace source said she was "sad" to miss the events today on the 73rd anniversary of the NHS.

As part of her work, Kate tests twice weekly with lateral flow tests as part of the Royal Household testing regime.

Kensington Palace said The Duchess followed the rules throughout Wimbledon about when to wear a mask.

The duchess will miss two royal engagements today
(Image: SplashNews.com)

William will still be attending both today's events, as per the government guidelines contacts of contacts do not need to isolate.

Kate is required to isolate for 10 days.

A spokesperson added: "Last week The Duchess of Cambridge came into contact with someone who has subsequently tested positive for Covid-19.

"Her Royal Highness is not experiencing any symptoms, but is following all relevant government guidelines and is self-isolating at home."

Kate had her first coronavirus vaccine on Friday, May 28.

At the time she tweeted: "Yesterday I received my first dose of the COVID-19 vaccine at London’s Science Museum. I’m hugely grateful to everyone who is playing a part in the rollout – thank you for everything you are doing."

Her husband the Duke of Cambridge Prince William received his first dose a week earlier after revealing he had secretly fought the virus in April last year.

He was forced to self-isolate from his family as he struggled to breathe.

(Image: REUTERS)

Royal aides told of their fears as William's symptoms progressively worsened before his eventual diagnosis.

William tested positive for coronavirus in April 2020, but kept his illness secret.

According to reports, it was not revealed at the time as he didn't wish to cause alarm and saying "there were important things going on and I didn't want to worry anyone".

Royal staff were said to be panicked as the heir to the throne began showing significant Covid-19 symptoms but he was able to continue phone and video engagements.