Kate Middleton made a stunning appearance at King Charles III's birthday parade amid her ongoing cancer treatment. Royal expert Katie Nicholl revealed to ET that despite the princess's swan-like grace, she is paddling frantically behind the scenes. Kate's preparation for the event was extensive, and her decision to attend Trooping the Colour was her own, with full support from her family, especially her father-in-law. Nicholl emphasized the significance of Kate's presence, noting her impeccable appearance and the importance of her being there for her family and the nation. While the event was a success, Kate's recovery will take time, and she may attend a few select engagements in the future, potentially including Wimbledon, a tournament she loves. Kate's strength and determination during this challenging time serve as an inspiration to all.