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,

The Princess of Wales said her cancer diagnosis came as a "huge shock." Kate Middleton and Prince William share three kids: George, Charlotte and Louis.

Prince William admitted to once buying his wife Princess Kate a particularly unusual gift: 'Honestly, I have no idea why... it seemed like a good idea at the time!'

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

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 has wished his wife, Catherine, a happy birthday as she turns 43. "To the most incredible wife and mother. The strength you've shown over the last year has been remarkable," William wrote in a message posted on social media.

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

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

The Princess of Wales is celebrating at home in Windsor with the Prince of Wales, with Prince George, Princess Charlotte and Prince Louis spending the day at school before a family celebration in the evening.

Princess Kate Middleton will soon be ringing in her 43rd birthday and a source says Prince William and their children are pulling out all the stops to make it as special and family-oriented as possible.