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 gushed over his wife, Kate Middleton, on her 43rd birthday. "To the most incredible wife and mother. The strength you’ve shown over the last year has been remarkable. George, Charlotte,

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.

The Prince of Wales said she is "the most incredible wife and mother" and included a message from their children.

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,

The Prince of Wales has penned a moving message to his "most incredible wife" in honour of her birthday today (9 January). The Princess of Wales turns 43 today and her husband, Prince William, took to social media to share a new portrait in honour of her birthday.

ANALYSIS: Royal Editor Emily Ferguson discusses the hidden messages in Prince William's emotional tribute to his wife.