Princess Eugenie shared a rare series of photos of her youngest son, Ernest 'Ernie' Brooksbank, to mark his first birthday on May 30, 2024.
"One year of you my dear Ernest. Happy birthday!!," the royal mum captioned the post.
"We all love you so much, especially your enormous smile you give the world.. but you always save an extra special one for Mumma. Xxx"
Royal fans were delighted by the images, flocking to the comments to send their wishes to the birthday boy.
Among the series of images, Princess Eugenie shared a shot of the tiny tot at play group with his name sticker on his hoodie.
This may have been a new tradition the royal mum was starting after sharing an almost identical photo for her older son's first birthday.
When August Brooksbank celebrated his first birthday on February 9, 2022, his famous mum shared this sweet photo of him.
Princess Eugenie also included a family shot showing husband Jack Brooksbank and herself with their son on a ski trip.
Lilibet Diana Mountbatten-Windsor celebrated her first birthday on June 4, 2022 with a party at Frogmore Cottage amid the Queen's Platinum Jubilee celebrations.
It was the first time royal fans got a proper look at the tiny tot — she had featured alongside her older brother Archie in a Christmas card photo in 2021 but it didn't clearly show her face.
A series of photos from Lilibet's birthday picnic party were shared by Prince Harry and Meghan, Duchess of Sussex upon their return to the US.
This official portrait was released by Buckingham Palace to celebrate Princess Anne's first birthday.
She is being held by her mother, Princess Elizabeth, and sitting next to her brother Prince Charles.
The Royal Family shared this photo on Instagram earlier this week ahead of the Princess Royal's 70th birthday in 2020.
Meghan Markle and Prince Harry opted to forgo the tradition of releasing a portrait for Archie's first birthday in 2020, instead releasing a video.
The cute clip, filmed by the Duke of Sussex in their LA home shows the Duchess reading 'Duck! Rabbit!' to their son.
The video was released to raise awareness for a campaign by Save The Children in the US and UK.
Prince Louis' first birthday was marked with a series of portraits captured by his mother Catherine, Duchess of Cambridge.
Taken at the family's country home in Norfolk, the photos depict Louis playing outside in the garden.
The Duchess of Cambridge is a keen photographer and decided to take her own portraits of daughter Princess Charlotte, to mark the young royal's first birthday.
This photo of Charlotte was taken at the Cambridge country home, Anmer Hall, in Norfolk.Â
This photo of Prince George was released to celebrate his first birthday.
It was taken during a visit to the Sensational Butterflies exhibition at the Natural History Museum, London, with his parents the Duke and Duchess of Cambridge.
Releasing a photo on, or close to, a first birthday is a tradition stretching back many years within the British royal family.
You would expect the heir to the British throne would have a first birthday to remember but unfortunately for Prince William his big day was very low key.
His parents, Prince Charles and Diana, Princess of Wales, were overseas on a royal tour of Canada at the time so he spend the day with his nanny, Barbara Barnes.
Prince Charles' press officer, Victor Chapman, said Diana was not happy about leaving her son alone for his first birthday so they celebrated in July with a big family party.
On the day, though, Charles and Diana phoned their son with Charles saying they could only "hear a few squeaks" from William.
No official photo of William was released. Instead, he had taken part in a photocall with his parents in New Zealand aged nine months (left) and again at 18 months inside the walled gardens of Kensington Palace (right).
A series of adorable photos of Prince Harry were released by the palace the month after his first birthday.
This was taken in October and featured the little prince learning how to crawl on the floor of his home in Kensington Palace.
This photo was taken of Lady Diana on her first birthday at her childhood home, Park House, in Sandringham.
The lavish property sits within the grounds of the Queen's Sandringham estate and it later became a hotel catering to people with disabilities.
Before she became Queen, this adorable bub was known as Princess Elizabeth Alexandra Mary of York.
Princess Elizabeth wasn’t born in a castle or palace, but at the five-storey London townhouse of her maternal grandparents, in Mayfair.
This photo is dated to January, 1927, a few months before Elizabeth turned one.
This official photo was released to mark the first birthday of Prince Charles, the heir to the British throne.
The accompanying information stated that Charles "is a big boy for his age" weighing in at nearly 11 kilograms.
According to a newspaper report from the day his mother "Princess Elizabeth has planned the party in the blue and gold drawing-room, and an iced birthday cake will be cut in the baby's honor".
Charles' father, Prince Philip, was absent for his son's first birthday, on naval duty in Malta.
The newspaper reported a "family reunion" was planned for November 19 when Princess Elizabeth would fly to Malta with her son.
No official portrait of Prince Andrew was released for his first birthday but the young royal was pictured a few weeks before his big day, in the back of a car with Queen Elizabeth, Prince Philip, Prince Charles and Princess Anne.
This adorable family photo was taken within the grounds of Frogmore House, in Windsor.
A young Prince Edward can be seen climbing on top of his pram, being held by his father, Prince Philip and sister, Princess Anne.
Behind is the Queen and Prince Andrew.
The photo was taken just a few weeks after Prince Edward's first birthday.
Princess Anne and her then-husband, Captain Mark Phillips, released this family portrait of their youngest child, Zara, and son Peter.
It was taken in November, six months after Zara had turned one.
For her first birthday Princess Beatrice was treated to a trip on board The Royal Yacht Britannia.
The bub is pictured here with her grandmother, the Queen, and her parents, the Duke and Duchess of York.
Beatrice was on board the vessel for the traditional Western Isle's Cruise, before arriving at Balmoral, for the annual royal summer break.
Like so many royals, Princess Eugenie was introduced to polo at a young age.
She was pictured with her mother Sarah, the Duchess of York, arriving at the royal Berkshire polo club, in Windsor, a couple of months after turning one.