Happy Birthday to Kate Middleton. The Princess of Wales officially turned 43 on Thursday, January 9 and the love is pouring in from all directions—including some sweet shoutouts from her royal in-laws.

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 is honoring his wife, Princess Catherine, on her 43rd birthday, calling her "the most incredible wife and mother."

In the photo, Middleton traded sleek coats and heels for something more casual. She wore a dark blazer jacket rolled and cuffed at the sleeves with a crisp white button-up top. Completing the outfit was a checked plaid printed scarf worn around the neck and fitted dark jeans with light whiskering at the hips.

The King and Queen were among the first to issue birthday wishes for the Princess of Wales King Charles and Queen Camilla are leading the way in wishing Kate Middleton a happy birthday. The Princess of Wales turned 43 on Thursday,

Kate Middleton may have retrieved from the spotlight within the past year, but that doesn’t mean her impact hasn’t been felt by the royals. The Princess of Wales, who is celebrating her 43rd birthday Thursday,

The Post understands that the princess will spend the special day at Adelaide Cottage, the Wales' family home.

Prince William makes a rare declaration of his love and admiration for his wife, Kate Middleton, on her 43rd birthday. The Prince of Wales shared the post on the royal couple’s official Instagram account,