Princess Kate, the wife of Prince William and mother to three future heirs, celebrated her 43rd birthday Thursday amid public admiration for her resilience during a challenging year. In a heartfelt message shared on social media, Prince William, now the Prince of Wales, paid tribute to his wife, praising her strength and devotion.

"To the most incredible wife and mother. The strength you've shown over the last year has been remarkable. George, Charlotte, Louis and I are so proud of you. Happy Birthday, Catherine. We love you," William wrote on X, formerly Twitter. The message was accompanied by a previously unseen black-and-white photograph of Kate, taken last summer in Windsor by photographer Matt Porteous.

This past year has been particularly trying for the princess, who publicly revealed her cancer diagnosis in March. Following abdominal surgery, Kate underwent preventative chemotherapy. In September, she announced the completion of her treatment but acknowledged that her recovery journey was ongoing. "My path to healing and full recovery is long, and I must continue to take each day as it comes," she shared in a video posted to social media.

The revelation of her diagnosis came after public speculation about her absence from royal duties. Kate's decision to step back temporarily from the spotlight sparked widespread concern and ultimately led to her candid announcement.

Throughout her recovery, Kate maintained a measured public presence, gradually returning to her royal engagements. Her first appearance following her treatment was in October, when she met with families of three children who had been killed in a knife attack in Southport, northwest England. The event underscored her ongoing commitment to supporting others, even during her personal struggles.

At a Christmas concert in December, Kate reflected on the challenges of the past year. Speaking with singer Paloma Faith, she said, "I didn't know this year was going to be the year that I've just had." Her words resonated with many who had followed her journey.

During the holiday season, Kate also emphasized themes of empathy and unity in her public messages. At her annual Christmas carol service, she spoke about the importance of kindness and understanding during difficult times. "The Christmas story encourages us to consider the experiences and feelings of others. It also reflects our own vulnerabilities and reminds us of the importance of giving and receiving empathy," she said.

Despite her health challenges, Kate continued to participate in major royal events, including Trooping the Colour, Wimbledon, and the Christmas Day church service at St. Mary Magdalene Church in Norfolk. At each occasion, her presence reassured the public of her resilience and dedication to her role.

Married to Prince William since April 2011, Kate has long been regarded as a pillar of stability within the British royal family. The couple shares three children: Prince George, 10; Princess Charlotte, 8; and Prince Louis, 5. Known for their commitment to family, the Prince and Princess of Wales often release personal photographs to mark special occasions, such as birthdays and anniversaries.

In June, the family shared a playful image of William jumping off a sand dune while holding hands with their children to celebrate his 42nd birthday. These glimpses into their private lives have endeared the couple to the public, offering a humanizing view of their otherwise formal roles.