It was just last week that we finally caught another glimpse of Prince Louis, this time during his christening at St. James's Palace on July 9.
Several members of the royal family - including Prince George and Princess Charlotte - have worn the dress, making it even more meaningful on Prince Louis' special day.
Fifth in line to the British throne, Prince Louis was born on April 23.
The shots were taken by world-class portraitist Matt Holyoak after Prince Louis' christening last Monday.
Prince Louis of Cambridge may be the smallest person in the official photographs of his christening but he was the most ostentatiously dressed.
The royal family pose for Prince Louis' christening photos.
Mr Holyoak told BBC News that "everyone was so relaxed and in such good spirits, it was an absolute pleasure".
The baby prince is pictured alert and with a wide open-mouth smile as he is held upright in the Duchess of Cambridge's arms.
The Queen and Prince Philip were notably absent in the portraits, having made the decision not to attend the christening, according to the UK's Press Association.
One woman added, "I would love to see a video of the lengths the photographer had to go to for the photos with the children!"
The Archbishop of Canterbury Justin Welby welcomed the royals at the entrance to the chapel.
During public appearances, Prince William always kneels down to Prince George and Princess Charlotte's levels so that he can talk to them face to face.
The Duke and Duchess of Cambridge were chatting to Novak Djokovic after his win at Wimbledon on Sunday, when the tennis star and father-of-two asked: "How are your children?"
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