The Princess of Wales is famed for the bouncy blow-dry and brunette locks which are the envy of royal observers.
Aside from making Kate look glam, however, the waves of glossy hair also hide a prominent scar on her head from when she was a child.
And it happens to be something she has in common with her husband, William, who also bears a large, if rarely noticed, scar on the left hand side of his head.
Kate’s three-inch blemish was first spotted in 2011 when the princess was conducting her first solo royal engagement at a black-tie private dinner at Clarence House.
Kate’s scar was first spotted when she attended a dinner at Clarence House in 2011
A statement explained that the scar, normally concealed, was from a childhood operation
Kate’s scar could be also seen while she was out with Prince William. He, too, has a scar on the left hand side of his head
Prince William has been left with a scar after a golfing accident when he was eight-years-old. He calls it his ‘Harry Potter scar’, like the one on the forehead of Potter actor Daniel Radcliffe
Stepping in for Charles, Kate wore a vintage silver evening gown with a beaded halter neck, her hair in a half-up, half-down style.
The scar on the side of her left temple was unexpectedly visible that night. Later, a spokesman confirmed it was the result of surgery carried out when she was a young child.
An official statement explained that ‘the scar related to a childhood operation,’ but said that details of the operation were a private matter.
Royal sources confirmed that it had been ‘a very serious operation’ but declined to comment further.
John Scurr, consultant surgeon at the Lister Hospital in London, said the scar was unlikely to have been the result of a tumour.
‘I really doubt it was any serious medical condition and I would say it is as a result of an arteriovenous malformation – a birthmark – being removed,’ he said.
‘It is remarkable, given the measurement, that no-one has noticed before.’
Her husband Prince William also has a scar on his head, which he previously dubbed his ‘Harry Potter scar’.
(The hero of the JK Rowling books carries a zig zag scar on his forehead, the result of a failed attempt to kill him).
William’s scar – which becomes inflamed when he plays sport – is said to have been sustained during a golfing accident.
According to Hello!, he suffered the injury in 1991 while he was playing golf with friends at school in Wokingham.
The eight-year-old prince had a fractured skull and was taken for an operation at Great Ormond Street Hospital in London.
Princess Diana stayed with him overnight and Prince Harry paid a visit the following morning before heading to school.
His father Charles also came to check in on his son, keeping contact with doctors when he left to go to the opera.
William told the story of the injury while he was being interviewed by a 10-year-old cancer patient for CBBC’s Newsround in 2009.
Speaking to Alice, a patient at the Royal Marsden Hospital, he pointed at his head, saying: ‘That was for my Harry Potter scar, as I call it, just here.
Prince William sustained a fractured skull following the golfing accident and he was taken to Great Ormond Street Hospital. His mother, Diana, stayed with him overnight
‘I call it that because it glows sometimes and some people notice it – other times they don’t notice it at all.
‘I got hit by a golf club when I was playing golf with a friend,’ he explained.
‘Yeah, we were on a putting green and the next thing you know there was a seven-iron and it came out of nowhere and hit me in the head.
‘I was in hospital, but that was very minor compared to how many times you’ve been into hospital.’