The British heir to the throne, Prince William, celebrates his 41st birthday on June 21st. Congratulations already came from his father. King Charles III shared a previously unseen dad and son moment from the rehearsals for his coronation on the royals’ official Instagram page.

The snap shows the two royals laughing as they rehearse a key moment of the coronation ceremony ahead of May 6th. William helped his father put on the royal robes. Charles’ Instagram post read: “Happy Birthday to the Prince of Wales today!”

The picture was taken by photographer Chris Jackson, who also posted it on his Instagram account. He wrote: “Happy Birthday to the Prince of Wales! Lovely to capture this relaxing moment behind the scenes at the coronation rehearsals.” In addition, Jackson showed a shot of the young Prince William and commented: “Here is a photo from the time when ER was behind the camera”.

Prince William played at the coronation of King Charles III. a key role. He caused a great emotional moment during the solemn ceremony in Westminster Abbey: After Charles was crowned, William promised him his loyalty and kissed his visibly touched father on the cheek.