Princess Catharina-Amalia of The Netherlands is in no rush to be queen.

The revelation was made on Tuesday in an authorized book about the eldest daughter and heir of Dutch King Willem-Alexander, which was released three weeks before her 18th birthday.

The book, titled "Amalia," delves into Amalia’s school life, her occasional work at a beach bar, her love of horseback riding and her education plans. The princess recently graduated high school and is taking a gap year before going to a university. She’s not yet sure what she will study but says she is interested in history, economics and law.

According to biographer Claudia de Breij, the Dutch royal told her she doesn’t feel ready to be queen and would ask her mother to step in should her father, 54, unexpectedly pass in the near future.

QUEEN ELIZABETH HOLDS FIRST IN-PERSON ENGAGEMENT SINCE MISSING REMEMBRANCE SUNDAY SERVICE DUE TO STRAINED BACK

Princess Catharina-Amalia

The Netherlands' Princess Catharina-Amalia is the eldest of King Willem-Alexander and Queen Maxima’s three daughters. (Photo by Patrick van Katwijk/WireImage/Getty Images)

"I said to my father, ‘You just keep on eating healthy and exercising a lot,’" said Amalia, as quoted by People magazine.

Amalia also revealed that she sometimes sees a mental health professional.

"I don’t think it is a taboo," the princess is quoted as saying in the book. "And it’s not a problem to say that in public. Everybody talks about healthy eating and sport. And that is also very important. But how important is it to maintain your mental health? You can’t have one without the other."

De Breij wrote the book following a series of meetings over the summer with Amalia. Similar books were published about her father and grandmother around their 18th birthdays as a way of introducing them to the public.

CLICK HERE TO SIGN UP FOR THE ENTERTAINMENT NEWSLETTER

PrincessCatharinaAmalia_King

King Willem-Alexander of The Netherlands with Princess Amalia. (Photo by Patrick van Katwijk/WireImage/Getty Images)

"It’s very cool," Amalia said of the book in a brief virtual conversation with De Breij released on Twitter by the Dutch Royal House.

"There are a lot of personal things about me in it," she said. "It’s quite exciting. I think the whole book paints a very beautiful portrait of who I am."

Earlier this year, Amalia sent a handwritten note to Dutch Prime Minister Mark Rutte informing him that she has decided for the next few years now to accept the allowance - worth some 1.6 million euros ($1.9 million) per year - that she is entitled to receive annually once she turns 18 in December.

Amalia said she would repay the money — which will still be deposited in her account — while she is still a student. The payment is made up of about 300,000 euros directly to the princess and 1.3 million to cover staff costs and other expenses.

CLICK HERE TO GET THE FOX NEWS APP

Dutch royal family

King Willem-Alexander of The Netherlands, Queen Maxima of The Netherlands, Princess Amalia of The Netherlands, Princess Alexia of The Netherlands and Princess Ariane of The Netherlands during the annual summer photocall at their residence Palace Huis ten Bosch on July 17, 2020 in The Hague, Netherlands.  (Photo by Patrick van Katwijk/Getty Images)

"I find it uncomfortable as long as I can offer little in return and other students have it so much more difficult, especially in these uncertain corona times," the princess wrote.

Rutte wrote back to congratulate Amalia on graduating high school and said he understood and appreciated her decision.

The move came at a time of declining popularity for the House of Orange in the Netherlands. Amalia’s parents faced harsh criticism last year when they took the family on vacation to their holiday home in Greece amid the COVID-19 pandemic. The family cut short the trip and hurried home after a public outcry at the vacation.

In a video message issued after their return in October last year, a somber Willem-Alexander told the nation: "It hurts to have betrayed your faith in us."

The vacation did not breach coronavirus restrictions but came just days after the Dutch government introduced what it called a "partial lockdown" in a bid to rein in soaring infections.

The Associated Press contributed to this report.