King Charles III is in the royal spirit.

After all, the monarch celebrated his 77th birthday alongside his wife Queen Camilla , 78, at Cyfarthfa Castle in South Wales on Nov. 14. And true to the family’s years-long tradition , he documented the milestone with a new portrait.

“77 today!” Buckingham Palace wrote on the Instagram post , which included a photo of Charles posed near the historic landmark. “Thank you for the kind words and well wishes on His Majesty’s Birthday. ”

Fittingly, Charles’ son Prince William and wife Kate Middleton , 43, also honored him on his special day. Posting the new photo on their Instagram Stories , the couple—who share kids Prince George , 12, Princess Charlotte , 10, and Prince Louis , 7—wrote, “Happy B

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