PHOTOS: Kate Middleton attends the Trooping the Colour parade — her first public appearance since her cancer diagnosis

The princess was driven to Buckingham Palace 30 minutes before the parade began, alongside her husband, Prince William, and children, Prince George, 10, Princess Charlotte, 8, and Prince Louis, 5.

Kate's appearance at the annual royal event comes nearly four months after she announced that she has cancer and had been undergoing preventative chemotherapy.

She shared the news in a video released to the public on March 22. Calls from the public for Kensington Palace to address the princess's health came to a head following the discovery that a photo of the Wales family, released on Mother's Day in the UK, had been digitally altered.

In a press release shared with Business Insider after her cancer diagnosis was made public, Kensington Palace said that she would be returning to work "when she is cleared to do so by her medical team."

The mother-of-three wore a black and white Jenny Packham dress adorned with a large bow at the neckline, per Town & Country. She accessorized the look with a white wide-brim hat, white heels, and pearl cluster earrings.

The outfit was completed with an Irish Guards Regimental Brooch, signifying her role as Colonel of the Irish Guards, which she took over from Prince William in 2022.

Kate, along with her children George, Charlotte, and Louis watched the parade from inside the Major General's office, according to Hello Magazine.

Meanwhile, Prince Willaim joined his uncle, Prince Edward, the Duke of Edinburgh, and his aunt, Princess Anne, the Princess Royal, on horseback for the ceremony.

William wore the Full Ceremonial Guard Order of the Welsh Guards, as he is colonel of the regiment, the magazine reported.

The family gathered on the palace balcony to watch the Trooping the Colour flypast.

Kate stood between her husband and her father-in-law, the King, as her three children stood in front.

She announced on Instagram and X that she was making "good progress" with her chemotherapy treatment and was looking forward to attending The King's Birthday Parade.

The post, accompanied by a new photograph of Kate taken at her home in Windsor earlier this week, read: "I have been blown away by all the kind messages of support and encouragement over the last couple of months. It really has made the world of difference to William and me and has helped us both through some of the harder times."

She added that she has been experiencing "good days and bad days."

She wrote that,"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."

Kate added that her treatment is ongoing but that she is starting to do "a little work from home" and that she hopes to attend more public engagements over the summer.

"I am learning how to be patient, especially with uncertainty," she added. "Taking each day as it comes, listening to my body, and allowing myself to take this much needed time to heal."