The Prince of Wales told Princess Kate "George, Charlotte, Louis and I are so proud of you" in a heartfelt birthday message.

Kate Middleton's 43rd birthday portrait was taken by Matt Porteous in Windsor Castle last summer. She is spending the day with Prince George, Princess Charlotte and Prince Louis.

Prince William shared a heartfelt tribute alongside a new photo of Princess Kate Middleton in honor of her 43rd birthday.

Prince William issues a new portrait and heartfelt message to wife Kate Middleton as she marks her 43rd birthday, writing "we love you" ...

Since she became the Princess of Wales, Kate Middleton has worn playful pantsuits and a plethora of polka dots.

Princess Kate is celebrated on her 43rd birthday with a new photo and a heartfelt message from Prince William.

Prince William penned a touching tribute Thursday to “remarkable” wife Kate Middleton as the royal celebrates her 43rd ...

Prince William showered his wife, Kate Middleton, with adoration in an emotional birthday tribute on Thursday (January 9), ...