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Princess Leonor steps into the spotlight on milestone birthday for historic swearing-in ceremony - best photos

The Spanish royal is following in her father King Felipe's footsteps  

Princess Leonor in madrid
Phoebe Tatham
Phoebe TathamContent Writer
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Princess Leonor's historic moment in the spotlight has finally arrived. On her milestone 18th birthday, the Spanish royal took part in a swearing-in ceremony before the Cortes Generales.

During the ceremony, the 18-year-old swore allegiance to the constitution, committing herself to the legal order as embodied in the Cortes.

princess leonor in car on her way to congress of deputies © Getty Images
Princess Leonor travelled alongside her sister Infanta Sofia

The heir to the Spanish throne promised to "faithfully perform her functions, keep and ensure that the Constitution and the laws are kept, and respect the rights of citizens and the Autonomous Communities."

princess leonor smiling in white suit © Getty Images
Leonor appeared in high spirits ahead of her milestone moment

Princess Leonor, who is currently undergoing military training in Zaragoza, will be supported on her big day by her parents King Felipe and Queen Letizia, as well as her youngest sister, Infanta Sofia, 16. Despite the media attention, the future queen appeared in high spirits as she stepped into the limelight surrounded by her loved ones.

WATCH: Princess Leonor swears allegiance to the Constitution

During one particularly heartfelt moment, the young royal shared a warm embrace with her parents who tenderly kissed her on the cheek following her moment in the spotlight. 

king felipe kissing daughter on cheek © Getty Images
King Felipe shared a tender moment with his daughter

For the special occasion, Princess Leonor looked elegant in a tailored white suit which she teamed with a pair of pointed block heels. She wore her blonde locks in a simple low ponytail and accentuated her features with fluttery mascara and a sweep of pink lipstick. 

Spanish royal family at the congress of deputies © Getty Images
The Spanish royal was joined by King Felipe VI, Queen Letizia and Infanta Sofia

As for accessories, the Spanish royal elevated her outfit with a pair of diamond drop earrings complete with glittering blue gems. 

princess leonor wearing white suit at congress of deputies© Getty Images
Princess Leonor donned a sleek white suit
princess leonor swearing allegiance © Getty Images
Princess Leonor attended the ceremony on her 18th birthday
leonor signing book of honour © Getty Images
The royal signed the Congress book of honour

Queen Letizia, 51, looked her usual polished self in a royal blue dress, whilst King Felipe cut a dapper figure in a smart black suit and a blue tie to match his wife's colourful garment.

spanish royals waving© Getty Images
The Spanish royals paused to wave to royal well-wishers

Sofia, meanwhile, turned heads in a striking floral cape dress crafted by Erdem which featured a whimsical bow around the neckline and a flattering black belt around the waist.

infanta sofia wearing erderm dress © Getty Images
Infanta Sofia looked so stylish in her Erdem dress

Following the ceremony, Princess Leonor and her family watched a spectacular military parade outside the Spanish Parliament. 

military parade in madrid © Getty Images
The royals watched a military parade after the ceremony

The 18-year-old looked on proudly wearing the medals of Congress and the Senate which were awarded to her in the Congress of Deputies. 

Princess Leonor wearing the medals from the Lower House and the Senate© Shutterstock
Princess Leonor wearing the medals from the Lower House and the Senate

Later in the afternoon, the Spanish royals will hold a reception at the Royal Palace of Madrid, where Leonor will receive the prestigious necklace of the Order of Charles III.

The prestigious piece of jewellery, created by Carlos III in 1771, represents Princess Leonor's readiness to one day become queen. King Felipe VI received the Collar of the Order of Charles III on his 18th birthday back in January 1986.

Juan Carlos I and Sofia will reportedly join the royals at a private family lunch after the ceremony.

The Congress of Deputies ahead of the ceremony © Getty Images
The Congress of Deputies ahead of the ceremony

If Leonor ascends to the throne as expected, she will be Spain's first queen regnant since her fourth great-grandmother, Isabella II, who reigned from 1833 to 1868.

It's been an incredibly busy period for the future queen of Spain. Back in August, Princess Leonor bid an emotional farewell to her parents as she kicked off her military training at the General Military Academy of Zaragoza.

Princess Leonor arrives at the General Military Academy© Getty Images
Princess Leonor bid farewell to Queen Letizia and Infanta Sofia

She will spend the first year of her training at the General Military Academy in Zaragoza, followed by a year in the navy. She will complete her third and final year at the General Air Academy.

The princess is following in her father Felipe's footsteps, who undertook his own military training, before obtaining a Law degree at the Autonomous University of Madrid. The future King later enrolled in a Master's Degree Course in International Relations at the Edmund Walsh School of Foreign Service of Georgetown University (Washington, DC).

King Felipe of Spain, Princess Sofia of Spain, Queen Letiza of Spain and Princess Leonor of Spain visit Los Jardines de la Alfabia gardens in Bunyol© Getty Images
Leonor is following in her father's footsteps

Princess Leonor's youngest sister Sofia, meanwhile, flew to the UK in August to start the first year of a two-year International Baccalaureate study program at UWC Atlantic College in Wales.

Other royals who have attended UWC Atlantic College include King Willem-Alexander of The Netherlands and his middle daughter, Princess Alexia, as well as Princess Elisabeth of Belgium and Princess Raiyah of Jordan.

What's next for Harry & Meghan? Find out on the latest episode of HELLO!'s A Right Royal Podcast...

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