The coming-of-age ceremony will not only be a milestone in Princess Leonor's life, it will also change the recent history of Spain, as she will be the first queen of Spain since the mid-19th century.
The ceremony of the Spanish Parliament taking the oath of allegiance to the Spanish constitution marked not only her growing age, but also her growing responsibility.
After the ceremony, delegates from all over Spain gathered to celebrate her birthday.
However, as a young man, Princess Leonor's celebration did not end.
She returned to the Military Academy shortly after the official party was over, and to Princess Leonor's surprise, her classmates held an intimate celebration for her.
According to the Spanish newspaper Aragonese Herald, Princess Leonor and eight classmates hosted a celebratory party for the public at a burger restaurant on Avenida de Goya in Zaragoza.
Princess Leonor wore a black sweater, blue jeans, and white sneakers to this private party that day.
In order not to cause trouble to the boss, the bodyguard communicated with the boss about some details half an hour before the party started, and of course, the boss was very welcome to the arrival of Princess Leonor, which was also a surprise for him.
At about 8:50, Princess Leonor's classmates arrived first, and the princess joined them after 20.
Afterwards, they also tasted the restaurant's signature meal: the star burger, cheesecake and hot chocolate chip cookies.
Like other young people, during the cake eating session, the students also turned off the lights and asked Princess Leonor to blow out the candles and make a wish.
The atmosphere was very relaxed and pleasant, and it is said that the words "You are old" were written on the cake.
Under the backdrop of the lively atmosphere, the cooperating boss played the song "Happy Birthday", and the people present also came to a chorus.
As the Happy Birthday chorus grows louder and louder, curious customers begin to wonder if their princess is celebrating her birthday in the restaurant on the second floor, and after receiving an ambiguous reply from the boss, they join the chorus one after another.
Originally, this was a very private and low-key party, just like an ordinary child's birthday, until the happy birthday song appeared, it could no longer be hidden.
At first, they thought it was just a child who looked like Princess Leonor for a birthday, but under the control of the bodyguards, they also knew the answer.
Although the bodyguards have been trying to control the scene, the high-profile actions of the students still attracted the crowd.
However, due to security and privacy concerns, bodyguards do not allow people to take pictures
Later, Princess Leonor also shared the cake with the people present, and one person present commented that the cake was delicious, and finally the bodyguard began to open one eye and close the other.
Although the gifts of the classmates are not valuable, they have a special meaning.
The students who attended the party gave Princess Leonor gifts, one of which was a photo frame, and Princess Leonor and her classmates shared the cost equally after the party.
According to the owner, Princess Leonor paid her part of the expenses with 20.3 euros in cash.
As a member of the royal family, Princess Leonor will take on her responsibilities and role as a member of the family.
For Princess Leonor, the celebration of her eighteenth birthday was a turning point and a new milestone for her parents, King Felipe VI and Queen Letizia.
Along the way, they have also witnessed the growth of their daughter.
At the coming-of-age ceremony, the daughter's maturity and self-confidence in strategizing, as well as her firm spirit, are enough to make them proud.