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.

William praised Kate for her "remarkable" strength in the post released on Thursday, Jan. 9 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,

Catherine, Princess of Wales, turned 43 on Thursday, with her husband Prince William praising her "strength" fighting cancer during the past year.

Prince William praised the 'strength' of his wife, Kate Middleton, in a romantic birthday message posted to Instagram. She turns 43 on Jan. 9.

Prince William has sparked a fan frenzy with his birthday message to his "incredible" wife, the Princess of Wales. The royal is celebrating her 43rd birthday today, with the family understood to be celebrating quietly at their home in Windsor.

Prince William celebrated wife Kate Middleton’s 43rd birthday with a touching tribute heralding her ‘strength’ over ‘the last year’ as she battled cancer

Kate Middleton, who is celebrating her 43rd birthday on Jan. 9, has proven herself to be the shiniest jewel of the British monarchy. The princess is married to Prince William, heir to the throne.

Kate Middleton is putting herself first as she rings in her birthday four months after announcing that she completed chemotherapy treatment for an undisclosed form of cancer. The Princess of Wales turned 43 on Jan.

Prince William has shared a loving tribute to Kate Middleton. We'll be bringing you the very latest updates, pictures and video on this breaking news story. Please check back regularly for updates on this developing story HERE .