Catherine, Princess of Wales, made her official return to the public eye at the annual Trooping the Colour ceremony in London June 15.

At the event, which honors King Charles III’s birthday, the princess rode in a carriage with her three children — George, 10, Charlotte, 9, and Louis, 6 — to watch the king’s birthday parade with the rest of the royal family.

She was seen wearing a white Jenny Packham black trim dress with a white and black ribbon bow on the neckline. Her hair looked perfectly coiffed under a white rimmed hat.

The princess also joined Charles, his wife Queen Camilla, along with Prince William and their three children on the balcony of Buckingham Palace.

In one photo, she appeared almost stoic as she looked on at the crowd gathered at the event.

Prince and Princess of Wales with their children, Prince Louis, and Princess Charlotte, King Charles III and Queen Camilla. (Gareth Fuller / Getty Images)© Gareth Fuller

The official Instagram account for Kensington Palace also shared behind-the-scenes videos of the family preparing for the event.

In one clip, Kate plays with Charlotte’s hair. In another, Louis cheekily waves from inside a carriage.

Trooping the Colour is Kate’s first public appearance since she revealed in March that she had been diagnosed with cancer and is undergoing preventative chemotherapy. Her last public engagement occurred nearly six months ago, with the family’s annual Christmas church outing in December.

Kate, who was named honorary colonel of the Irish Guards in 2023, did not attend the Colonel’s Review June 8. The Colonel’s Review, which functions as a dress rehearsal ahead of Trooping the Colour, would normally involve the princess taking a salute.

The princess sent a note to the Irish Guards ahead of the June 8 ceremony, apologizing for her absence and wishing the regiment good luck.

Kate confirmed that she would attend Trooping the Colour in a statement June 14, her first update on her health since announcing her diagnosis.

“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. But on the good days, when you feel stronger, you want to make the most of feeling well,” she said.

She confirmed that her treatment will continue for “a few more months.” She hopes to attend more public engagements this summer but said she’s “not out of the woods yet.”

Kate has not shared what kind of cancer she was diagnosed with. In March, she shared the news of her treatment in a video message and said her doctors found cancer after she underwent abdominal surgery in January.