Princess Charlotte and Prince George's friendship bracelets feature in newly released picture of future King

In the image, George's bracelet could clearly be seen above the cuff of his shirt.

King Charles, 75, has also been spotted wearing the "friendship bracelet" during recent engagements, including last week for his visit to Guernsey with Queen Camilla.

Made up of yellow and red thread, the band was similar to those sported by His Majesty's granddaughter, Princess Charlotte, when she attended the Wimbledon final with her mother, Princess Kate.

Dressed in a navy polka-dot dress, Charlotte wore two threaded bracelets, one featuring various shades of pink and another boasting green, blue and pink fabric.

Friendship bracelets have seen a resurgence in popularity over the summer due to the success of Taylor Swift's Eras tour.

Prince George and Princess Charlotte attended her show at Wembley last month.

The bracelets swapped by Swifties tend to feature beads with lettering spelling lyrics and song names.

However, Charlotte, George and Charles's accessories are made from plain coloured thread.

Prince George, the eldest child of the Prince and Princess of Wales, was born George Alexander Louis on July 22, 2013, in the Lindo Wing of St Mary's Hospital, Paddington, London.

In the photo, which was shared on the Kensington Palace social media accounts, George's hair was combed to one side while he wore a dapper suit.

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The future King is often dressed smartly when he steps out in public.

However, this photo showed the royal looking a little more relaxed with an open collar instead of a tie.

Posting the snap on their social media accounts, the Waleses captioned the picture: "Wishing Prince George a very happy 11th birthday today!"

They confirmed the snap had been taken by Kate sometime this year.