Kate Middleton, who turns 43 on Jan. 9, 2025, shares Prince George, Princess Charlotte and Prince Louis with husband Prince William. See the royals' sweet family photos here.

Happy birthday Princess Kate! And happy new-royal-portrait-day to the rest of us. In honor of Kate Middleton's 43rd birthday on January 9, Prince William shared a new, black-and-white portrait of the Princess of Wales on the couple's official Instagram, with a sweet message in the caption.

Prince William is celebrating Kate Middleton on her 43rd birthday. In a break with palace tradition, the Prince of Wales wrote a personal, heartfelt message in honor of his wife's special day alongside a new photo of the princess on Instagram.

Catherine, Princess of Wales, turns 43 on Jan. 9 and received a sweet message from her husband, Prince William.

The Prince of Wales posted a birthday message for his wife, Catherine, Princess of Wales to social media on Thursday to celebrate her 43rd birthday.

Prince William lovingly paid tribute to the Princess of Wales's 'remarkable' strength as he shared a touching birthday post

Prince William is celebrating his love and admiration for Kate Middleton as she marks her 43rd birthday. In a message posted to the couple's social media, William, 42, paid tribute to Kate after a year in which she had a major operation, a cancer diagnosis and debilitating chemotherapy treatment.

Prince William praised the strength of the Princess of Wales after a turbulent year, offering a 43rd birthday wish on social media that described her as an incredible wife and mother.

Princess Kate is celebrating her 43rd birthday. Her husband, Prince William, honored the "most incredible wife and mother" in a new post.