Prince Louis was Prince Charming at the Trooping the Colour parade.

The 6-year-old showcased his adorable personality alongside his family June 15 at the annual royal event, which marked his mom Kate Middleton's first official appearance since revealing her cancer diagnosis in March.

Standing with his mother, dad Prince William, siblings Prince George, 10, and Princess Charlotte, 9, grandfather King Charles III and his wife Queen Camilla on a Buckingham Palace balcony, Louis showcased his dance moves while watching the springtime military parade and flypast celebrating the monarch's birthday, prompting his sister to appear to tell him to stop.

The Prince and Princess of Wales' youngest son was also seen yawning while watching the proceedings, bringing to mind a similar candid moment from Charles' coronation in 2023. 

"A memorable day at The King's Birthday Parade," Kate and William said on Instagram after Trooping the Colour concluded. "From the Irish Guards Trooping their colour to seeing so many faces on the Mall, thank you for making it a day to remember."

Kate, who last took part in a public royal engagement last Christmas, announced her intent to attend the Trooping the Colour parade June 14, one week after apologizing in a letter to the Irish Guards—of which she serves in the ceremonial role of Colonel—for missing a key rehearsal for the military event.

"I'm looking forward to attending The King's Birthday Parade this weekend with my family," the princess wrote in an Instagram post, "and hope to join a few public engagements over the summer, but equally knowing I am not out of the woods yet."

She also gave an update on her health battle. "I am making good progress, but as anyone going through chemotherapy will know, there are good days and bad days," Kate said. "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."

She said her "treatment is ongoing and will be for a few more months," later adding, "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."

Read on to see photos of the royal family at the Trooping the Colour parade...

Kate Middleton smiled as she appears with the royal family at Trooping the Colour, an annual ceremonial military event celebrating King Charles III's birthday. It marked the Princess of Wales' first public royal engagement since December 2023, and her first major appearance since revealing her cancer diagnosis in March 2024.

The Wales family waved at the crowd from a Buckingham Palace balcony.

Prince George, 10, and Prince Louis, 6, had a chat.

Prince William and Kate Middleton shared a sweet moment.

Prince William and Kate Middleton appear on the Buckingham Palace balcony with kids Prince George, 10, Princess Charlotte, 9, and Prince Louis, 6.

Kate Middleton, Prince William, Prince George, Prince Louis and Princess Charlotte are seen arriving at Trooping the Colour.

King Charles III was accompanied in a carriage by his wife, Queen Camilla. 

Kate and her kids are seen inside their carriage.

Prince George and Princess Charlotte waved to royal fans on the ride.

Prince Louis was spotted in his signature style.

The Princess of Wales, who's been undergoing a course of preventative chemotherapy, sat beside her youngest child during their carriage ride.

Prince William was joined by Princess Anne and Prince Edward as they rode on horseback.

The Princess of Wales arrives at her first formal appearance in six months. Kate appeared at the Trooping the Colour parade two months after revealing she is undergoing cancer treatment.

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