Catherine, Princess of Wales, made her first public appearance on Saturday since announcing to the world that she was undergoing preventive cancer treatment.

The British royal was photographed smiling and waving at the crowd during the annual Trooping the Colour parade, which is held every year to celebrate the monarch’s birthday. The 42-year-old mom of three was seen riding in a covered carriage with her three children: Prince George, 10, Princess Charlotte, 9, and Prince Louis, 6. 

Prince William, who is first in line to the throne, rode in the parade on horseback. Later, the royal family was photographed together as they watched a Royal Air Force fly over from the balcony of Buckingham Palace.

The Princess of Wales has been keeping a low profile since announcing her cancer treatment in March. This came after she stopped attending public events following planned abdominal surgery early in the year. 

“In January, I underwent major abdominal surgery in London and at the time, it was thought that my condition was non-cancerous,” she said at the time. “The surgery was successful. However, tests after the operation found cancer had been present.”

“My medical team therefore advised that I should undergo a course of preventative chemotherapy and I am now in the early stages of that treatment,” the princess added.

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The Princess of Wales said she was “blown away by all the kind messages of support and encouragement” she’s received so far amid cancer treatments.

“I am making good progress, but as anyone going through chemotherapy will know, there are good days and bad days. On those bad days you feel weak, tired and you have to give in to your body resting,” she said in the update. “But on the good days, when you feel stronger, you want to make the most of feeling well.”

“My treatment is ongoing and will be for a few more months,” Catherine added. “On the days I feel well enough, it is a joy to engage with school life, spend personal time on the things that give me energy and positivity, as well as starting to do a little work from home.”