Kate Middleton WILL join Prince William and their three children for summer getaway at Balmoral this month in what will be the Princess of Wales's longest journey since her cancer diagnosis

The Princess of Wales is set to join the Royal Family at Balmoral this month in what will be her longest journey since her cancer diagnosis, The Mail on Sunday can reveal.

Prince William and Kate have decamped to the 50,000-acre estate in the Scottish Highlands each summer since their wedding in 2011, but some insiders feared this year could be different due to the princess’s health.

Since the announcement that she was undergoing preventative chemotherapy in March, Kate has mostly balanced her time between Adelaide Cottage, their home in Windsor, and Anmer Hall, their holiday home in Norfolk, which are around 125 miles apart.

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The Princess, 42, also travelled the short distance to London for Trooping the Colour in June and to Wimbledon for the men’s singles final in July, both of which are an hour’s drive from Windsor.

But sources have confirmed to The Mail on Sunday that Kate will join her husband and their three children north of the border this summer.

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Prince William, Prince of Wales and Catherine, Princess of Wales on West Sands beach after taking part in a land yachting session on May, 2021 in St Andrews, Scotland

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The Mail On Sunday can reveal that the Princess of Wales join the Royal Family at Balmoral (pictured) this month in what will be her longest journey since her cancer diagnosis

Her attendance will be seen by many as further reassurance that the princess is making ‘good progress’ after her diagnosis.

In June she told the public in an emotional message she was ‘not out of the woods yet’ and had ‘good days and bad days’, adding that her treatment would continue for ‘a few more months’.

She said that on her good days it was ‘a joy’ to ‘spend personal time on the things that give me energy and positivity’.

The annual holiday at Balmoral is a tradition for the royals, where they can relax in the peaceful countryside.

Long country walks and fishing are typical pastimes, with William and Kate known to enjoy cycling through the leafy grounds. Kensington Palace declined to comment.