Britain's Duke and Duchess of Sussex, Prince Harry and Meghan Markle, have christened their son Archie Harrison Mountbatten-Windsor in an "intimate service" at Windsor Castle.

The royal couple released two photographs from the ceremony on their official Instagram account on Saturday. They were taken by Chris Allerton, who took their wedding photographs.

Archie was baptised in front of close family and friends in the private chapel at Windsor Castle wearing the handmade replica of the royal christening gown which has been worn by royal infants for the last 11 years.

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The Duke and Duchess of Cambridge attended but were not thought to have their three children with them. The Queen did not attend the service due to a prior engagement.

Meghan Markle's mother Doria Ragland was at the service which was officiated by the Archbishop of Canterbury, Justin Welby.

A statement released along with the images from the christening said: "The Duke and Duchess are so happy to share the joy of this day with members of the public who have been incredibly supportive since the birth of their son.

"They thank  you for your kindness in welcoming their first born and celebrating this special moment."

The royal couple opted to exclude the press and the public from the day and chose not to reveal the names of Archie's godparents.

It is thought that they are keeping the identities of Archie's godparents a secret to protect their privacy as non-public figures.

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Archie was born on May 6, with the couple revealing his name two days later.