Kate Middleton is officially 43 years old! The Princess of Wales marked her latest birthday on Jan. 9, releasing a stunning portrait of herself beaming on social media. The photo was accompanied by a touching message from her husband,

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.

Kate, the Princess of Wales, turns 43 on Thursday, capping what was a tumultuous year for the mother of three and wife of Prince William. Kate, who was born Jan. 9, 1982, is expected to spend her birthday privately with William and their kids -- Princes George and Louis and Princess Charlotte -- at home in Windsor, England.

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.

The Princess of Wales was with her family on her special day. Catherine, who turn 43 on Thursday, Jan. 9, spent her birthday at home at Adelaide Cottage, Windsor with her husband, the Prince of Wales,

That, of course, was followed by the shock of her cancer diagnosis, so this will be the perfect opportunity to celebrate." Jennie added that Prince William "isn't exactly known for his overtly public displays of affection or romantic gestures,