Every family tree has its lookalikes, and the British monarchy is no different.
Many of the current crop of royals are the spitting image of their ancestors, whether two, three or four (or more) generations back.
Read on through the gallery and prepare to do some double-takes.
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Royal fans have praised the Prince and Princess of Wales' official Christmas photo for 2023, with some eagle-eyed followers pointing out one of their children's uncanny resemblance to a notable royal.
Fans have pointed out Princess Charlotte's resemblance to her late great-grandmother Queen Elizabeth, who died in September 2022.
Here, Elizabeth poses for a black-and-white photo portrait at the age of nine in 1932.
"Princess Charlotte is looking like Great Grandmama every year," one Twitter follower commented.
"I can also see our late queen in Princess Charlotte," another said.
Princess Charlotte is now eight and she has stolen the show in the official portrait, positioned front and centre, her legs crossed and her long hair falling well past her shoulders.
She is dressed similarly to her mother, the Princess of Wales, in jeans, trainers and a white shirt.
The photo was released on the family's social media accounts along with the caption: "Our family Christmas card for 2023.
The coronation of King Charles III was the first event of its kind in 70 years, and, naturally, royal watchers drew parallels between the son of Queen Elizabeth II's official crowning and that of his mother's.
One such parallel – that was undeniable – was the resemblance between Charles and his five-year-old grandson, Prince Louis, noticed by fans during Louis' appearance on Buckingham Palace's balcony.
In this photo, taken at the June 1953 event, a four-year-old Charles is pictured in the centre, standing directly to his mother's left.
Seven decades later, Louis struck the same pose as his grandfather at the same occasion – pointing up at the sky during the flypast.
Louis delighted at the historic event, pulling a myriad of faces on the balcony and during his carriage rides to and from Westminster Abbey.
The Prince and Princess of Wales had also reportedly planned to have a nanny on standby at the Abbey in case he misbehaved – though whether they actually did bring one with them remains unclear.
Louis did, however, disappear during the lengthy coronation ceremony for a time, but eventually came back.
A significant part of the late Prince Philip's life of service was his time in the Royal Navy, which he joined in 1939.
Like his son, the disgraced Prince Andrew, and grandson, Prince Harry, the late Duke of Edinburgh saw active service – he served on the battle ship HMS Valiant in 1941, which fought in World War II from the Indian Ocean to the Mediterranean.
By this time, Philip had met his future wife, the then-Princess Elizabeth, and the duo had been corresponding via letters. The future Queen Elizabeth II also served in World War II, enrolling in the Women's Auxiliary Territorial Service and serving as second subaltern – the equivalent of second lieutenant – and training as an auto mechanic.
After they married in 1947, Philip and the late Queen were stationed in Malta – which is where Philip is pictured here – which ended when King George VI died in 1952.
Philip and his grandson Harry, however, have more than their active duty in the armed forces in common...
Once the masses recovered from the shock of Prince Harry's surprise arrival in London on March 27, many began pointing out his resemblance to his late grandfather, Prince Philip, as the paparazzi shots taken outside the Royal Courts of Justice began circulating.
The Duke of Sussex, 38, is among a group of high-profile celebrities who have taken legal action against Associated Newspapers (ANL), the publisher of the Daily Mail, accusing the group of breaches of privacy and the illegal gathering of information. ANL describes the claims as "preposterous smears".
On the second day of the four-day preliminary hearing, Harry accused the royal family of staying silent about him being a victim of phone hacking because it might "open up a can of worms".
Queen Elizabeth II may no longer be with us, but there's no denying she lives on in her descendents' faces.
In fact, people say her youngest granddaughter in particular is the spitting image of Elizabeth in her younger days.
Lady Louise Windsor is regularly compared to her late grandmother.
The resemblance was pointed out by many as the daughter of Prince Edward and Sophie, Countess of Wessex attended events in the days following the Queen's death on September 8, 2022.
"[She] looks exactly like a young Queen Elizabeth. Were she a brunette, the resemblance would be uncanny," one person tweeted.
"Lady Louise is someone I've never seen before this week but she looks JUST like a young Queen Elizabeth II right," another person said.
"She looks exactly like her grandmother when she was young. It's amazing," another tweet reads.
Louise is also compared to Queen Mary, formerly Mary of Teck, who is her great-great-grandmother.
"Amazing resemblance!" one Twitter user declares, adding, "Astonishing how genetics pass through generations!"
"She's a Teck through and through," another says.
If you ask us, it's all in the eyes, mouth and face shape.
Like grandmother, like granddaughter — Queen Elizabeth II clearly inherited many of her most distinctive features from Queen Mary.
The resemblance is particularly clear around the eyes and nose, as seen in this 1952 photo of the monarch.
Looking at portraits of a young Queen Victoria, it's not hard to see her genes have made their presence known in one of the current generation of royals...
Princess Beatrice shares many of her famous ancestor's facial features, including her eyes and her mouth.
The resemblance between the two women is often remarked upon by royal watchers.
Interestingly, the eldest daughter of Prince Andrew and Sarah, Duchess of York was named after the youngest of Queen Victoria's daughters, Princess Beatrice.
Beatrice also had a small role as a lady-in-waiting in The Young Victoria, a 2009 film about the historic queen produced by her mother.
Princess Mary was Queen Elizabeth's aunty, which makes her Zara Tindall's great-grandaunt.
Well... we think.
One thing we *are* sure about is the fact is the two women share a strong resemblance.
Compare the two photos and you'll see plenty of similarities in Zara and Mary's faces — particularly the eyes.
The resemblance between the late Princess Margaret and her socialite granddaughter Lady Margarita Armstrong-Jones has also been pointed out by observers.
Here, Margaret – who died two months before Lady Margarita was born in 2002 – attends the premiere of the film Captain Horatio Hornblower in London in 1951 when she was 21.
When you see the next photo, you'll understand why people feel like they're seeing double.
Lady Margarita Armstrong-Jones may have never met her grandmother, but that doesn't mean she's far from her mind.
The 20-year-old photographer and jewellery designer – who is the daughter of Margaret's son David Armstrong-Jones, 2nd Earl of Snowdon and Serena Armstrong-Jones, Countess of Snowdon – is pictured here in aTatler magazine's Little Black Book Party last night in London, when she arrived in a white faux fur coat, eerily reminiscent of her grandmother's 1951 ensemble.