Tiara Trifecta! Queen Letizia of Spain Sparkles with Princess Mary and Queen Margrethe at State Banquet

Royal orders were also exchanged during the first Spanish state visit to Denmark in 43 years

Queen Letizia of Spain, Crown Princess Mary of Denmark and Queen Margrethe are a trifecta in tiaras!

On Monday, the three royals glittered in the ultimate royal accessory at a state banquet at Christiansborg Palace in Copenhagen. The glamorous evening capped the first full day of Queen Letizia and King Felipe’s state visit to Denmark, which runs until Wednesday.

Queen Letizia, 51, glittered in the Fleur de Lys tiara — nicknamed “La Buena” or "The Good One." Meanwhile, Queen Margrethe, 83, sported the Danish Emerald Parure Tiara and Princess Mary, 51, topped her look with the Diamond Necklace Tiara. The Court Jeweller notes that the piece is uniquely convertible and can be worn as a tiara or necklace — and Mary has done both.

While the women wore gowns for the diplomatic dinner, King Felipe, 55, and Crown Prince Frederik, also 55, looked classic in military uniforms.

Related: Prince Christian of Denmark's 18th Birthday Celebrated with Royals from Around the World (and Tiaras!)

The Spanish royals also added a truly special new accessory: pale blue Order of the Elephant sashes. The Danish Royal Court announced the awards of Denmark’s highest honor of chivalry on Monday, explaining that the designation came directly from the Queen.

“When foreign heads of state pay a state visit, there is a tradition that in connection with the state visit there is an exchange of orders and medals if both the host country and the country from which the visit is made have a law enforcement agency,” a statement said.

The memo noted that there has not been a Spanish state visit to Denmark since 1980, in a trip by Felipe’s parents, King Juan Carlos and Queen Sofia.

As part of the latest exchange, Princess Mary and Prince Frederik also received the Grand Cross of the Spanish Order of Isabella the Catholic. They appeared to wear the new honor at dinner, along with the order’s signature yellow and white sash, per Identify Medals.

King Felipe and Queen Letizia embarked on the three-day state visit to celebrate and strengthen the relationship between the two countries and made the trip with the Spanish minister for foreign affairs plus a business delegation. The festivities began with an official welcome at Copenhagen Airport, where Queen Margrethe, her eldest son, her daughter-in-law and her sister Princess Benedikte greeted Felipe and Letizia.

In a total princess moment, Princess Mary dipped into a major curtsy when she greeted King Felipe. The bend is a gesture of respect in royal circles, and Felipe’s high royal rank as monarch likely inspired Mary’s deep dip.

Queen Margrethe and King Felipe then inspected a Royal Life Guard and later traveled by carriage with Queen Letizia from The Citadel to Christian VII’s Palace at Amalienborg, where the Danish royals live.

In a sweet snap the Danish Royal Court shared to Instagram, King Felipe put a warm around Prince Vincent, Princess Mary and Prince Frederik’s 12-year-old son — who is his godson! The crown prince couple are also parents to Prince Christian, 18, Princess Isabella, 16, and Princess Josephine, who is Vincent’s twin.

Related: Future Queen of Spain Princess Leonor Rings in 18th Birthday with Tradition — and a Symbolic New Necklace

King Felipe later had a meeting with Danish Prime Minister Mette Frederiksen at Christiansborg Palace and stepped out there again in the evening for the state banquet.

Last month came with banner celebrations for both the Danish and Spanish royal families, as heirs to both thrones turned 18. Prince Frederik and Princess Mary’s eldest son, Prince Christian, turned 18 on Oct. 15, and the special occasion was marked with a balcony appearance at Amalienborg Castle followed by a glittering gala at Christiansborg Palace that night.

The party at the palace doubled as a mini royal reunion, and Prince Christian posed for a group photo with four fellow future European monarchs. Prince Christian was all smiles beside Princess Estelle of Sweden, 11, Princess Ingrid Alexandra of Norway, 19, Princess Catharina-Amalia of the Netherlands, 19, and Princess Elisabeth of Belgium, 21, in the snap that the Danish Royal House shared to Instagram. Like Prince Christian, the princesses all follow their parents — Crown Princess Victoria of Sweden, Crown Prince Haakon of Norway, King Willem-Alexander of the Netherlands and King Philippe of Belgium — in the line of succession as their first-born children.

The Spanish royal family was not at the gala, though King Felipe and Queen Letizia’s eldest daughter Princess Leonor is also among the next generation of future European monarchs. The Princess of Asturias is currently enrolled in a three-year military training with the Spanish Army, Navy and Air Force on her road to the throne.

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The future queen of Spain turned 18 on Oct. 31 and marked the milestone by swearing allegiance to the Spanish Constitution. Princess Leonor was accompanied by her parents and 16-year-old sister, Princess Sofia, to the Congress of Deputies in Madrid, where she pledged her loyalty to her country before the Cortes Generales (the Spanish parliament) as she came of age.

"I swear to faithfully carry out my duties, to keep and ensure that the Constitution and the laws are kept, to respect the rights of citizens and the Autonomous Communities, as well as loyalty to the King,” Leonor said during the solemn ceremony in the Chamber, per the Spanish royal court.

The Princess of Asturias continued an important tradition as she reached the age of majority and followed in her father’s footsteps. According to the court, article 61.2 of the Spanish Constitution states that “The Crown Prince, upon reaching of age, and the Regent or Regents upon taking charge of their functions, will take the same oath, as well as that of fidelity to the King.”

According to the Danish Royal Court, the busy schedule for the next two days of the Spanish state visit includes stops at a business conference, wreath-laying at The Citadel, visits to the University of Copenhagen, a tour of Mary Elizabeth’s Hospital and much more.

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