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The future queen of Spain, who reaches the milestone on October 31, has been making solo appearances and training at the General Military Academy in Zaragoza.
King Felipe and Queen Letizia were proud parents as they presided over a ceremony at their daughter's military academy.
Pictures of Spain's Princess Leonor completing basic military training have been released.
King Felipe and Queen Letizia's eldest daughter, Princess Leonor, 17, has reached a new milestone at military school
And - perhaps in a bid to avoid Megxit round two - royal families from around the world have given their 'spares' more and more to do - even though some of them are still teenagers.