Prince William poses with his three children in a new picture to mark Father’s Day.

Prince William poses in Norfolk with his children last month (Image: Instagram/princeandprincessofwales)

Prince William has marked Father’s Day by sharing a new picture with Prince George, Princess Charlotte and Prince Louis.

The sweet image, which was taken by the Princess of Wales, shows the proud dad and his children all facing away from the camera.

William is standing centred, with both Louis and Charlotte either side of him. George, who will celebrate his 11th birthday next month, is standing next to his brother.

All dressed in casual attire, including William wearing a cap, the picture was taken when the family visited Norfolk last month.

Alongside the picture was a sweet message from the children, which read: “We love you, Papa. Happy Father’s Day [pink-heart emoji] G, C & L.”

Although they were previously not thought to be in attendance, George, Charlotte and Louis joined in the celebrations on Saturday to mark this year’s Trooping the Colour in London.

The young trio looked delighted to step out alongside their mother, who is currently undergoing cancer treatment, and celebrate the monarch’s birthday.

Royal fans took to social media to express their delight at the new picture of William, George, Charlotte and Louis.

One fan commented: “Love this photo [red-heart emoji].”

Prince George, Charlotte and Louis appeared on the balcony yesterday (Image: GETTY)

Another fan commented: “Beautiful. Family is everything [red-heart emoji].”

A third fan commented that this is their “favourite photo” of William and his children, with another stating that it is like they are “looking into the future together”.

Praising William, another commente: “What a great father and loyal son William is. I admire him so much [red-heart emoji].”

As well as joining their mother in a carriage yesterday, George, Charlotte and Louis made an appearance on the Buckingham Palace balcony for the annual flypast.

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Prince William pictured with Kate and their children last year (Image: GETTY)

Known for his cheeky antics, Louis was spotted taking a slight tumble as he stood alongside his siblings and mum Kate before the spectacular military parade began.

News footage appeared to catch the moment in the reflection of the impressive glass windows of the Palace.

In another hilarious moment, Charlotte was captured giving her younger brother a telling off. A lip-reading expert said that Charlotte appeared to tell Louis: “You have to stop doing that. Watch the parade”, to which he replied: “I won’t”.