Behind-the-Scenes Photos of Duchess Sophie's Great-Aunt Duties with Charlotte

The Duchess of Edinburgh joined the Prince and Princess of Wales and their three children on the Buckingham Palace balcony on Saturday, 13 June, for the Trooping the Colour celebrations.

While the festivities were underway, Sophie shared a sweet behind-the-scenes moment with her great-niece Charlotte, 11, and her two great-nephews George, 12, and Louis, eight.

In an adorable new photograph, the Duchess was spotted keeping an eye on the Waleses' children as the royals gathered to watch the ceremony from the Buckingham Palace windows. Louis looked enthralled at what was going on outside, while his siblings kept their composure.

Charlotte was her great-aunt's twin in matching white attire as they were pictured side-by-side inside the palace. The Duchess looked elegant in an off-white belted dress for the special occasion with a sharp collar. She finished her formal look with a complementary white hat with an extravagant floral detail.

Princess Charlotte's angelic off-white dress by Alessandra Rich featured a traditional collar with appliqué detail and a statement bow at the nape of her neck. The young royal wore her hair half up for the day with a matching white bow by Jane Taylor London at the back. She completed her look with a pair of Pretty Ballerinas ballet pumps.

'Princess Charlotte has become something of a fashion icon for timeless, heritage-inspired dressing,' baby and kids stylist, Charlotte Kewley, said. 'Her outfits are always beautiful and avoid any obvious trends, but it's the thoughtful details that make her look; the neatly tied hair bow, velvet collars, patent Mary Janes, and the classic wool coat.'

The well-behaved royal siblings travelled to Buckingham Palace together on Saturday in the same carriage as their mother, the Princess of Wales. Brothers George and Louis were dressed in their most formal attire for the occasion, both looking grown up in suits with matching light blue ties.

The Princess of Wales was seen quietly parenting her three children throughout the day. She sat beside her youngest child, Louis, in the Ascot Landau luxury carriage and was seen chatting with her eight-year-old son on the journey.