Kate Middleton watches George, Charlotte and Louis play in a horse drawn carriage at Windsor Castle

The Duchess of Cambridge was spotted watching on as her three children playing in a horse drawn carriage recently in the grounds of Windsor Castle.

Kate Middleton, 40, appeared relaxed as she watched on while her children Prince George, eight, Princess Charlotte, six, and Prince Louis, four climbed aboard a horse-drawn carriage and could be seen sitting patiently once inside.

Dressed in a casual brown midi dress and white trainers, Kate, who shares her three children with her husband Prince William, 39, appeared to chat to her children as they sat in the carriage in the castle’s Quadrangle.

Meanwhile, Princess Eugenie, 32, appeared to be nearby, holding the hand of her son August, one, while he took some toddling steps on the gravel. 

The undated clip, which was shared online, also appeared to show other members of the royal family, including Zara and Mike Tindall. It was unclear if their children, Mia, eight, Lena, three, and Lucas, one, were in attendance. 

The Cambridge children, (pictured L-R) Prince George, eight, Princess Charlotte, six, and Prince Louis, four, were recently filmed playing in a horse-drawn carriage in Windsor Castle’s quadrangle as their mother the Duchess of Cambridge, 40, (pictured, right) watched on (pictured in April 2020)

Princess Eugenie also appeared to be present in the footage, holding the hand of her one-year-old son August (pictured)

Princess Eugenie also appeared to be present in the footage, holding the hand of her one-year-old son August (pictured)

In the undated footage, it is not clear which of the Queen’s other 12 great-grandchildren were present, or whether the Duke of Cambridge was there. 

In the front row of the carriage appeared to be two blonde haired children, who could be the Queen’s eldest great-grandchildren Savannah and Isla Philips. 

Meanwhile Zara and Mike appeared to a baby between them as they watched the carriage of children.  

Completing the family affair was a black dog, who was seen running around and even underneath the large, ornate carriage. 

Several of Queen Elizabeth's great-grandchildren were recently filmed playing in a horse-drawn carriage in Windsor Castle's quadrangle (the Queen pictured at Windsor Castle this week)

Several of Queen Elizabeth’s great-grandchildren were recently filmed playing in a horse-drawn carriage in Windsor Castle’s quadrangle (the Queen pictured at Windsor Castle this week)

Social media users seemed delighted by the footage, with some describing it as ‘awesome’, and ‘cute’. 

The footage showing royal children in a carriage led others to speculate that the family members were preparing for a public appearance. 

This footage of the Cambridge children follows reports that they are set to have a ‘starring role’ at the Queen’s Platinum Jubilee celebrations this summer.

According to the Telegraph, the trio are expected to have a ‘visible’ part in the celebrations to mark the monarch’s 70th year on the throne, as part of a ‘royal show of force’.

It is thought the young royal siblings will make their debut in the carriage to the Trooping the Colour, and will also likely be seen on the Buckingham Palace balcony for the famous flyover.

The Queen's granddaughter Zara Tindall and her husband Mike also appeared to join the group in the quadrangle, although it was unclear which of their children were in attendance

The Queen’s granddaughter Zara Tindall and her husband Mike also appeared to join the group in the quadrangle, although it was unclear which of their children were in attendance 

William was four, the same age of his youngest son Louis, when he had his first carriage ride alongside Princess Diana and the Queen mother at 1988’s Trooping of the Colour. 

The Duke and Duchess of Cambridge will likely not confirm their children’s attendance until the last minute. 

While the final plans for the weekend are still being drawn up, it is understood William will be taking the lead on military events, including standing in for Her Majesty reviewing the Trooping of the Colour in a formal inspection the week before the jubilee weekend.

In the front row of the carriage appeared to be two blonde haired children, who could be the Queen's eldest great-grandchildren Savannah and Isla Philips

In the front row of the carriage appeared to be two blonde haired children, who could be the Queen’s eldest great-grandchildren Savannah and Isla Philips

Meanwhile, Kate will continue her work with early years learning and will help coordinate Superbloom, the project which sees the Tower of London flooded with hundreds of flowers and even a slide.

Elsewhere, Prince Charles will host a bank holiday concert and the Duchess of Cornwall will host a Big Lunch.

Other members of the royal family including Prince Edward, Sophie Wessex, Princess Anne, Peter Phillips, Zara Tindall, Princess Beatrice and Princess Eugenie will make appearances throughout the weekend.

Her Majesty, 96, will undergo less engagements than at previous jubilees due to mobility problems.

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