It seems like only yesterday Crown Princess Mary and Crown Prince Frederik of Denmark welcomed their eldest son and heir to the throne.
But already, Prince Christian is quickly progressing through his school years - and the latest update about the teen royal is possibly his most impressive yet.
On Wednesday, the Danish royal palace shared a special update on the young Prince, who is coming to the end of his ninth school year.
Alongside a striking portrait of the grown up Prince, the palace wrote an update in Danish, which roughly translates to: "At the end of June, His Royal Highness will finish ninth grade at Tranegårdskolen in Gentofte, where the Prince has been a student since first grade."
The statement continued: "The prince wants to continue his schooling at Herlufsholm Gymnasium in Næstved, where he is registered for the school's food department after the summer holidays."
In the image, Christian is seen sitting on a chair gazing upwards.
With a mop of brown hair and a round, warm face, the resemblance to his mother Princess Mary is uncanny.
But of course, those eyes and colouring is also a dead ringer for his dad Prince Frederik.
Earlier this year, the royals shared another important milestone coming up for the young Prince.
Christian is set to be confirmed into the church on May 15 - an event that will be celebrated by his family and royal watchers.
The location of the confirmation, Fredensborg Castle Church, has hosted a number of other royal confirmations before Prince Christian's, including his father Frederik's.
It's just another sign of growing up for the second in line to the throne.
Meanwhile, his three younger siblings Princess Isabella, 13, Princess Josephine, and Prince Vincent, both 10, won't be far behind.
They really do grow up far too fast!