The internet notices a strange detail about Prince Louis in a previously posted video by Kate Middleton: “He doesn’t look like his siblings!”

Prince LOUIS is Back in the SPOTLIGHT! What Has CATHERINE’S SON Caught the Attention This Time?

Prince Louis has once again found himself in the spotlight. The youngest child of the Prince and Princess of Wales has once again got fans of the royal family talking about him.

On September 9, the famous family released a video in which Catherine, Princess of Wales, announced that she had finally finished her chemotherapy treatment. Fans of the royal family got a behind-the-scenes look at the child-parent relationship within the dynasty, and especially Princess Catherine and her youngest son Prince Louis. At the beginning of the touching clip, mom and dad can be seen walking through the woods with 11-year-old Prince George, 9-year-old Princess Charlotte and 6-year-old Prince Louis.

He’s adored by royal fans around the world for his expressive behaviour – and Prince Louis didn’t disappoint as he attended the Trooping the Colour ceremony today.

During just one of his many animated displays, the young prince was caught on camera scrunching up his face, while Kate, 42, appeared to crouch down to talk with her son on a balcony on Horse Guards Parade.

The Prince and Princess of Wales‘ youngest child, was also captured yawning at the London event, which usually consists of more than 1,400 parading soldiers, 200 horses, 400 musicians and a flyover of 70 aircraft.

Seemingly not occupied enough by the parade, at one point, the cheeky six-year-old was even caught tugging on the cord for the blinds as he chatted to his mother.

Louis, who was wearing a double breasted blazer, a pair of shorts, a crisp shirt and a tie, could not hide his facial expressions – much to the enjoyment of royal fans.

And the Prince looked less than impressed during the ride, knitting his brows together at points as he stared out of the window, open-mouthed.

Prince William took part in the parade on horseback, while his children appeared alongside their mother in a carriage.

Ahead of her appearance, the Princess penned a moving personal message thanking the public for their support over her cancer diagnosis and revealing she is looking forward to attending the traditional ceremonial day.

Back in March, the Princess disclosed she was undergoing ‘preventative chemotherapy’ for an undisclosed form of the disease says her treatment is on going and will be for several months to come.

While she will not be returning to public duties full-time, she revealed that she does now feel well enough, however, to undertake a small number of public engagements in the coming months.

To mark the news Kensington Palace have also released a stunning new portrait of the princess taken at Windsor this week by Matt Porteous showing her looking well and in a reflective mood.

In her message the Princess says she has been ‘blown away’ by all the kind messages of support and encouragement over the last couple of months.

‘It really has made the world of difference to William and me and has helped us both through some of the harder times,’ she wrote.

Movingly she reveals she is making ‘good progress’, but adds: As anyone going through chemotherapy will know, there are good days and bad days. On those bad days you feel weak, tired and you have to give in to your body resting. But on the good days, when you feel stronger, you want to make the most of feeling well.’

William and Kate smile at each other on the Buckingham Palace balcony in London today© Provided by Daily Mail

She added: ‘My treatment is ongoing and will be for a few more months. On the days I feel well enough, it is a joy to engage with school life, spend personal time on the things that give me energy and positivity, as well as starting to do a little work from home.

‘I’m looking forward to attending The King’s Birthday Parade this weekend with my family and hope to join a few public engagements over the summer, but equally knowing I am not out of the woods yet.

‘I am learning how to be patient, especially with uncertainty. Taking each day as it comes, listening to my body, and allowing myself to take this much needed time to heal.

Thank you so much for your continued understanding, and to all of you who have so bravely shared your stories with me.’

The Princess first announced that she had cancer on March 22.

In a hugely moving video statement, recorded at Windsor, she revealed that she had been diagnosed following serious abdominal surgery in January and was already undergoing ‘preventative’ chemotherapy.

In a deeply personal, unprecedented and emotional video message filmed just two days earlier, Catherine revealed the news had come as a ‘huge shock’ and that she and William ‘have been doing everything we can to process and manage this privately for the sake of our young family’.

Kate beams as she accompanies her children in a carriage during today’s procession (pictured L-R: Kate, Prince Louis, Princess Charlotte)© Provided by Daily Mail

‘It has taken us time to explain everything to George, Charlotte and Louis in a way that is appropriate for them, and to reassure them that I am going to be ok,’ she said.

‘As I have said to them; I am well and getting stronger every day by focusing on the things that will help me heal; in my mind, body and spirits. Having William by my side is a great source of comfort and reassurance too. As is the love, support and kindness that has been shown by so many of you. It means so much to us both.’

Kensington Palace said at the time that it would not be sharing details of what kind of cancer the princess has, or what stage of cancer it is and asked people not to speculate.

At the time of her abdominal surgery in January, Kensington Palace said that it was non-cancerous. They confirmed again in March that is the case and that no tests had confirmed the presence of cancer. However post-operative tests subsequently found that cancer ‘had been present’.

A week ago, the royal apologised for missing out on a key rehearsal for the event, writing a letter to the Irish Guards, saying: ‘I hope I am able to represent you all very soon’.