© Photo: PAPrincess Leonor and Princess Sofia of Spain are only a year and a half apart in age. They've grown up in the spotlight and shared the sweetest sisterly moments during public engagements and private family events.
Queen Letizia and King Felipe's daughters were most recently spotted attending a military parade on Spain's National Day in Madrid, accompanying their parents.
The girls, ten and nine in age, wore matching Carolina Herrera coats in different colours and matching braids in their hair.
Click through to see their sweetest sisterly moments...
© Photo: PAThe adorable duo grinned from ear-to-ear as they took in celebrations on Spain's National Day.
© Photo: PATwinning in tweed! The stylish sisters stepped out in colorful jackets for 2016 Easter mass with their family.
© Photo: PAThe girls love wearing matching braids, taking after their mum Letizia!
© Photo: PALetizia and Felipe proudly looked on as their daughters waved to well-wishers during Spain's 2015 National Day celebrations.
© Photo: PALeonor and Sofia were dressed in their Sunday best attending Easter Mass at the Cathedral of Palma de Mallorca.
© Photo: PADuring public engagements, the duo, who could pass as twins, are never far from each other.
© Photo: PAFelipe's daughters gave their paternal grandfather, King Juan Carlos, a hand at his official 2014 abdication ceremony at the Royal Palace in Madrid.
© Photo: PAThe Spanish princesses shared a tender moment in 2015 with their father King Felipe at their home in Madrid.
© Photo: PAThe princesses were dressed to the nines in brocade dresses at their father's coronation ceremony in 2014.
© Photo: PAAt the 2013 service they wore matching floral frocks and cardigans.
© Photo: PAThe sisters looked excited celebrating Spain's 2010 FIFA World Cup championship at Zarzuela Palace.
© Photo: PAMummy-daughter(s) date! The princesses strolled the streets of Palma with mum Letizia during the 2010 Copa Del Rey regatta.
© Photo: PAThe youngsters horsed around during a 2010 family outing in Palma, Mallorca.
© Photo: PAThe girls showed off their cheeky side during a visit to the Museum of Glass in Palma de Mallorca with their mum and paternal grandmother, Queen Sofia.
© Photo: PALeonor and Sofia were pretty in pink during a 2009 summer family vacation in Mallorca.
© Photo: PALeonor sweetly held on to her little sister Sofia's hand as they left Easter mass in 2009.
© Photo: PAAnother sweet shot of the girls' twinning style!
© Photo: PAThe royal siblings clasped hands as they arrived for their first day of the school year at Santa Maria de los Rosales in 2010.
© Photo: PAThe sisters showed off their team spirit in La Furia Roja jerseys as they welcomed Spain's soccer team to Zarzuela Palace after winning the 2012 UEFA European Championship.
© Photo: PAThe sisters gave a wave at Princess Leonor's (right) First Communion at the Asuncion de Nuestra Senora Church in Madrid.
© Photo: PALetizia cuddled her daughters close at their home in Madrid.
© Photo: PAOff to school! Sofia held tightly on to her big sister Leonor's (right) hand as they arrived at the Santa Maria de los Rosales school in 2012.
© Photo: PAAll aboard! Leonor and Sofia looked excited hopping on a tourist train to Soller from Palma in Majorca.
© Photo: PAThe little Spanish royals looked adorable while at the 2010 Copa Del Rey Regatta with their family.
© Photo: PAThe Spanish royals looked picture perfect posing for a family portrait in 2012.
© Photo: PAThe princesses joined their parents for a sweet family photo during their 2015 summer holiday at the Marivent Palace in Palma de Mallorca, Spain.
