The Princess of Wales joined the royal family in her first public appearance since Christmas and her first since announcing she was undergoing cancer treatment.
After weeks of uncertainty, he announced yesterday (June 14) that he would be attending Trooping the Color to mark King Charles' official birthday.
Catherine wore a black and white dress with a bow to celebrate the occasion, matching her wide-brimmed hat.
She was first seen in the car on the way to Buckingham Palace alongside the Prince of Wales and their three children, before the youngsters sat on her lap on the balcony.