Kate Middleton Joins Royal Family on Buckingham Palace Balcony at Trooping the Colour

Kate Middleton is back on the balcony of Buckingham Palace amid her cancer treatment. 

The Princess of Wales, 42, who hasn't attended a public event with the royal family since Christmas, attended Trooping the Colour on June 15.

For the day's grand finale — the Royal Air Force's flypast over London — she stood on the royal residence's balcony with her husband, Prince William, and their children, Prince George, 10, Princess Charlotte, 9, and Prince Louis, 6, as they joined King Charles (who is also undergoing treatment for cancer), Queen Camilla and more royals for the monarch’s annual birthday parade. 

Princess Kate, who wore a white dress by Jenny Packham adorned with the Irish Guards Regimental Brooch and paired with a hat by Philip Treacy, took part in the royal processional earlier in the event, riding in a horse-drawn carriage with her three children.

The Princess of Wales has attended Trooping the Colour every year since marrying Prince William in 2011, except for 2020 and 2021 when the event was scaled down due to the COVID-19 pandemic.

Kate, who is undergoing chemotherapy after being diagnosed with cancer earlier this year, shared a health update on June 14, revealing in a personal message that she is “making good progress” but has “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.

The Princess of Wales said her cancer treatment will continue for "a few more months."

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"I’m looking forward to attending the King’s Birthday Parade this weekend with my family and hope to join a few public engagements over the summer, but equally knowing I am not out of the woods yet," she said in a message released the day before Trooping the Colour took place.

"I am learning how to be patient, especially with uncertainty. Taking each day as it comes, listening to my body, and allowing myself to take this much-needed time to heal. Thank you so much for your continued understanding, and to all of you who have so bravely shared your stories with me."

Despite maintaining a low public profile since her cancer announcement in March, Kate was recently spotted out with her family and running errands solo, sources told PEOPLE. The Princess of Wales said in her June 14 message that she is "starting to do a little work from home" and expressed a "hope to join a few public engagements over the summer.

However, no date has been set for her to fully return to her royal duties and any outings in the coming months will be based on when she feels able and under the guidance of her medical team.