Pictured: Kim Jong-un's secret daughter seen on state TV for first time

The face of Kim Jong-un’s daughter has been quietly revealed in North Korean propaganda, experts in China believe.

The girl – tentatively identified as Kim Ju-ae, the dictator’s only known child – appeared on stage at the country’s National Day celebrations earlier this month.

She was one of several children performing a song for Kim Jong-un and his wife, Ri Sol-ju, but something about her in particular stood out to experts.

Writing under the alias Samhero, one analyst on the InDPRK blog noted how Ri Sol-ju reaches for this particular girl at the end of the show.

She places her hand on the child’s back and is seen talking to her personally, only breaking off when she needs to move another girl out of her husband’s path.

And when the other children huddle around Kim Jong-un, jumping with excitement, she appears calmer, even grabbing another girl’s arm to hold her back when she follows him too closely.

The analyst saw further clues during the actual performance itself: the camera focuses on her as the singing begins, lingering for several seconds, before returning to her again and again.

Meanwhile, her appearance stands out too – she is the only girl wearing her hair down, and the only one donning white socks.

Furthermore, the Kims themselves seem very invested in the performance – at one point the camera cuts directly from the beaming first family to a close-up of the girl.

At times, Kim's sister, Kim Yo-jong, apparently wipes away tears.

Others have noted that the girl performed just once, when Kim was in attendance – apparently missing a repeat performance the following night.

Michael Madden, an expert on the North Korean elite, said Kim’s daughter would be of a similar age to the girl in question.

He said: “She would be close to ten years old in 2022 which is about the age of the girl shown in state media footage.”

The existence of Kim Ju-ae was confirmed by basketball star Dennis Rodman who visited Kim Jong-un in 2013, making her the only child of the secretive family that is known about.

However, others have long been talked about.

“The current rumours intelligence about the children of Kim Jong-un says that he has three children, two daughters and one son," said Mr Madden, a fellow of The Stimson Center in Washington DC who also runs the North Korea Leadership Watch website.

“That said, the information feeds about his children are contradictory and speculative. Some information about their children derives from observation of state media photos in which Madame Ri appears to be pregnant.”

North Korea’s ruling regime is notoriously tight-lipped about its first family - in part because of fears they could be targeted.

“Potential adversaries among North Korean elites, if aware of the identities of the leader’s children, could present a vulnerability," said Mr Madden.

“Instead of fomenting a coup or insurrection against the political leadership, the children could be kidnapped or harmed as a means of attaining leverage over the leader."

“This applied to Kim Jong-un when he was growing and could very well apply to his own children.”

Kim himself was only made known to his countrymen in 2010, the year before the death of his father and predecessor, Kim Jong-il.

Mr Madden said: “When Kim Jong-un was a child and teenager, he was kept cloistered from all but the top North Korean elites who had close family or personal relationships to his father.

“North Korean elites could not interact with him or his siblings without his father’s approval.