The shared Instagram account for Kate Middleton and Prince William welcomed a trio of guest posters Sunday, when children Prince George, Princess Charlotte, and Prince Louis took the platform over. The occasion: Father's Day, with a post in tribute to their dad, the Prince of Wales.

Kate Middleton made a poignant appearance alongside the royal family at Trooping the Colour, one year after her powerful return to public life amid cancer treatment.

The body language expert also highlighted the significance of Princess Kate's turquoise coat dress, saying, "It is the color of tranquility, of protection, it denotes healing. The white that's included in her outfit is a significant color. It's, again, tranquility and peace, cleanliness and neutrality."