Crown Princess Mette-Marit and Crown Prince Haakon of Norway at a gala dinner celebrating The Crown Prince's 50th birthday at Christiansborg Palace Chapel on May 26, 2018, in Copenhagen, Denmark Prince Frederick's younger brother Prince Joachim arrives at the gala with his wife Princess Marie of Denmark during the gala banquet celebrating the 50th birthday of The Crown Prince at Christiansborg Palace Chapel in Copenhagen, Denmark King Philippe of Belgium arrives with his wife Queen Mathilde at a gala dinner celebrating The Crown Prince's 50th birthday at Christiansborg Palace Chapel on May 26, 2018, in Copenhagen, Denmark Grand Duke Henri of Luxembourg with his wife Grand Duchess Maria Teresa at a gala dinner celebrating The Crown Prince's 50th birthday at Christiansborg Palace Chapel on May 26, 2018, in Copenhagen, Denmark King Carl Gustaf of Sweden with Queen Silvia arrives at a gala dinner on the occasion of The Crown Prince's 50th birthday at Christiansborg Palace Chapel on May 26, 2018, in Copenhagen, Denmark Denmark's Crown Prince Frederik's impressive uniform included gold epaulets, a red-and-gold collar, and a chest full of medals, while Crown Princess Mary topped her heavily-sequined light pink dress with a tiara, as they celebrated his 50th birthday with a glittering gala at one of Copenhagen's palaces, attended by fellow European royals. Denmark's Crown Prince Frederik impressive uniform included gold epaulets, a red-and-gold collar, and a chest full of medals, while he carried an elaborate fur hat in his white-gloved left hand along with a sword. His wife looked every bit the Crown Princess as she topped her heavily-sequined light pink dress with a tiara and matched her husband with a turquoise sash arrived at the dinner at Christiansborg Palace. Princess Benedikte of Denmark wore a regal light blue gown and a more elaborate tiara arrived at the gala dinner at Christiansborg Palace Crown Princess Victoria with her husband Prince Daniel of Sweden arrived at the gala dinner at Christiansborg Palace in Copenhagen King Willem-Alexander of The Netherlands and Queen Maxima of The Netherlands arrive at the gala banquet on the occasion of The Crown Prince's 50th birthday at Christiansborg Palace Chapel on May 26, 2018, in Copenhagen, Denmark. King Willem-Alexander of The Netherlands and Queen Maxima of The Netherlands arrived at the dinner at Christiansborg Palace in Copenhagen, Denmark. King Willem-Alexander of The Netherlands and Queen Maxima of The Netherlands arrived at the dinner at Christiansborg Palace in Copenhagen, Denmark. King Willem-Alexander of The Netherlands and Queen Maxima of The Netherlands arrived at the dinner at Christiansborg Palace in Copenhagen, Denmark. King Willem-Alexander of The Netherlands and Queen Maxima of The Netherlands arrived at the dinner at Christiansborg Palace in Copenhagen, Denmark. Crown Prince Frederik and Crown Princess Mary during a carriage ride to the gala banquet on the occasion of The Crown Prince's 50th birthday at Christiansborg Palace Chapel on May 26, 2018, in Copenhagen, Denmark. (R-L) Queen Margrethe II of Denmark, Crown Prince Frederik of Denmark and Crown Princess Mary of Denmark arrived at the gala dinner at Christiansborg Palace in Copenhagen, Denmark. (R-L) Queen Margrethe II of Denmark, Crown Prince Frederik of Denmark and Crown Princess Mary of Denmark arrived at the gala dinner at Christiansborg Palace in Copenhagen, Denmark. Crown Prince Pavlos of Greece and Crown Princess Marie Chantal of Greece arrived at the gala dinner at Christiansborg Palace in Copenhagen, Denmark. (R-L) Queen Margrethe II of Denmark, Crown Prince Frederik of Denmark and Crown Princess Mary of Denmark arrived at the gala dinner at Christiansborg Palace in Copenhagen, Denmark. Crown Prince Pavlos of Greece and Crown Princess Marie Chantal of Greece arrived at the gala dinner at Christiansborg Palace in Copenhagen, Denmark. Princess Theodora of Greece and youngest brother Philippos of Greece arrived at the gala dinner at Christiansborg Palace in Copenhagen, Denmark. Princess Olympia of Greece and her younger brother Prince Achileas-Andreas of Greece arrived at the gala dinner at Christiansborg Palace in Copenhagen, Denmark. (R-L) Queen Margrethe II of Denmark, Crown Prince Frederik of Denmark and Crown Princess Mary of Denmark arrived at the gala dinner at Christiansborg Palace in Copenhagen, Denmark. Princess Olympia of Greece and her younger brother Prince Achileas-Andreas of Greece arrived at the gala dinner at Christiansborg Palace in Copenhagen, Denmark. Princess Theodora of Greece chose the Antique Corsage tiara to set off her pink gown. The royal, who is also an actress who goes by the stage name Theodora Greece, looked beautiful in the elaborate diamond and pearl headpiece. Denmark's Crown Prince Frederik and wife Crown Princess Mary, who was stunning in the Diamond, Ruby and Spinel Necklace tiara, during a carriage ride to the gala banquet at Christiansborg Palace Chapel in Copenhagen, Denmark. Crown Princess Victoria of Sweden with her husband Prince Daniel of Sweden arrived at the gala dinner at Christiansborg Palace in Copenhagen, Denmark Crown Princess Victoria of Sweden wore one of her favorite looks, the 19th century Baden Fringe tiara. The headpiece, which has 47 diamond "sunrays", can also be worn as a necklace. Crown Princess Mette-Marit of Norway opted for a Diamond Daisy Bandeau tiara at the gala dinner at Christiansborg Palace in Copenhagen, Denmark. Prince Alois of Liechtenstein and Princess Sophie of Liechtenstein arrived at the gala dinner at Christiansborg Palace in Copenhagen, Denmark. King Philippe of Belgium and Queen Mathilde of Belgium arrived at the gala dinner at Christiansborg Palace in Copenhagen, Denmark. Princess Benedikte of Denmark wore a regal light blue gown and a more elaborate tiara arrived at the gala dinner at Christiansborg Palace Crown Prince Haakon of Norway and Crown Princess Mette-Marit of Norway arrived at the gala dinner at Christiansborg Palace in Copenhagen, Denmark. (R-L) Queen Margrethe II of Denmark, Crown Prince Frederik of Denmark and Crown Princess Mary of Denmark arrived at the gala dinner at Christiansborg Palace in Copenhagen, Denmark. Crown Princess Victoria of Sweden with her husband Prince Daniel of Sweden arrived at the gala dinner at Christiansborg Palace in Copenhagen, Denmark Crown Princess Mary of Denmark was stunning in the Diamond, Ruby and Spinel Necklace tiara. The tiara thought to be recently-acquired, and which the Crown Princess only started wearing a few years ago, dates back to the early 20th century, attends the Crown Prince Frederik's 50th birthday party on May 26, 2018 King Philippe of Belgium and Queen Mathilde of Belgium arrived at the gala dinner at Christiansborg Palace in Copenhagen, Denmark. (R-L) Queen Margrethe II of Denmark, Crown Prince Frederik of Denmark and Crown Princess Mary of Denmark arrived at the gala dinner at Christiansborg Palace in Copenhagen, Denmark. Crown Prince Haakon of Norway and Crown Princess Mette-Marit of Norway arrived at the gala dinner at Christiansborg Palace in Copenhagen, Denmark. Queen Mathilde of Belgium sparkled in her go-to tiara, the Laurel Wreath. The beautiful piece was made in 1912 and boasts more than 600 diamonds. Princess Olympia of Greece and her younger brother Prince Achileas-Andreas of Greece arrived at the gala dinner at Christiansborg Palace in Copenhagen, Denmark. Crown Prince Haakon of Norway and Crown Princess Mette-Marit of Norway arrived at the gala dinner at Christiansborg Palace in Copenhagen, Denmark. Princess Olympia of Greece made her gala debut in a fringe tiara often worn by her mother, Crown Princess Marie-Chantal. The 21-year-old was among the new generation of royals to attend, along with her brother Prince Achileas-Andreas and Prince Joachim of Denmark's model son Prince Nikolai. Crown Princess Victoria of Sweden with her husband Prince Daniel of Sweden arrived at the gala dinner at Christiansborg Palace in Copenhagen, Denmark (L-R) Prince Nikolai of Denmark, with stepmother Princess Marie of Denmark and his father Prince Joachim of Denmark, arrived at the gala dinner at Christiansborg Palace in Copenhagen, Denmark. Princess Alexandra of Berleburg arrived at the gala dinner at Christiansborg Palace in Copenhagen, Denmark. (L-R) Prince Nikolai of Denmark, with stepmother Princess Marie of Denmark and his father Prince Joachim of Denmark, arrived at the gala dinner at Christiansborg Palace in Copenhagen, Denmark. (R-L) Queen Margrethe II of Denmark, Crown Prince Frederik of Denmark and Crown Princess Mary of Denmark arrived at the gala dinner at Christiansborg Palace in Copenhagen, Denmark. (R-L) Queen Margrethe II of Denmark, Crown Prince Frederik of Denmark and Crown Princess Mary of Denmark during the gala banquet on the occasion of The Crown Prince's 50th birthday at Christiansborg Palace Chapel on May 26, 2018, in Copenhagen, Denmark. Crown Princess Mary of Denmark curtsey to Queen Margrethe II of Denmark, alongside with husband Crown Prince Frederik of Denmark who is celebrating his 50th birthday at a gala dinner in Copenhagen, Denmark. (C) Queen Margrethe of Denmark, Crown Prince Frederik of Denmark and Crown Princess Mary of Denmark during the gala banquet on the occasion of The Crown Prince's 50th birthday at Christiansborg Palace Chapel on May 26, 2018, in Copenhagen, Denmark. King Carl Gustaf of Sweden and Queen Silvia of Sweden arrived at the gala dinner at Christiansborg Palace in Copenhagen, Denmark. Grand Duke Henri of Luxembourg and Grand Duchess Maria Teresa of Luxembourg during the gala banquet at Christiansborg Palace Chapel in Copenhagen, Denmark Countess Alexandra of Denmark during the gala banquet at Christiansborg Palace Chapel in Copenhagen, Denmark. Alexandra, Countess of Frederiksborg opted the Alexandrine Drop tiara, a nuptial gift from her ex-mother-in-law Queen Margrethe II that she had also worn on her wedding day. Queen Margrethe of Denmark during the gala banquet on the occasion of The Crown Prince's 50th birthday at Christiansborg Palace Chapel on May 26, 2018 in Copenhagen, Denmark. Queen Margrethe of Denmark wore something that we don't often see – a bold gold tiara. The Naasut parure was a gift from Greenland in 2012 for the Danish monarch's 40th anniversary on the throne. Queen Margrethe II of Denmark wore a bold gold tiara. The Naasut parure was a gift from Greenland in 2012 for the Danish monarch's 40th anniversary on the throne. King Carl Gustaf of Sweden and Queen Silvia of Sweden during the gala banquet on the occasion of The Crown Prince's 50th birthday at Christiansborg Palace Chapel on May 26, 2018 in Copenhagen, Denmark. Queen Margrethe II of Denmark in a bold gold The Naasut parure tiara, was a gift from Greenland in 2012 for the Danish monarch's 40th anniversary on the throne. Queen Margrethe II of Denmark during the gala banquet on the occasion of The Crown Prince's 50th birthday at Christiansborg Palace Chapel on May 26, 2018 in Copenhagen, Denmark. Crown Prince Frederik and Crown Princess Mary during a carriage ride to the gala banquet on the occasion of The Crown Prince's 50th birthday at Christiansborg Palace Chapel on May 26, 2018 in Copenhagen, Denmark. Queen Margrethe of Denmark during the gala banquet on the occasion of The Crown Prince's 50th birthday at Christiansborg Palace Chapel on May 26, 2018 in Copenhagen, Denmark. King Philippe of Belgium and Queen Mathilde of Belgium during the gala banquet on the occasion of The Crown Prince's 50th birthday at Christiansborg Palace Chapel on May 26, 2018 in Copenhagen, Denmark King Carl Gustaf of Sweden and Queen Silvia of Sweden during the gala banquet on the occasion of The Crown Prince's 50th birthday at Christiansborg Palace Chapel on May 26, 2018 in Copenhagen, Denmark. Grand Duchess! Grand Duchess Maria Teresa of Luxembourg wore the heirloom pearl-accented Chaumet tiara, which can also be worn as a choker. (L-R) Prince Nikolai of Denmark, with stepmother Princess Marie of Denmark and his father Prince Joachim of Denmark, arrived at the gala dinner at Christiansborg Palace in Copenhagen, Denmark. Princess Sophie of Liechtenstein opted for the Hapsburg Fringe Tiara made by Köchert around 1890, as she attends the gala dinner on the occasion of The Crown Prince's 50th birthday at Christiansborg Palace Chapel in Copenhagen, Denmark. Princess Benedikte, sister of both Queen Margrethe of Denmark and Queen Anne-Marie of Greece, also wore a fringe style tiara. The royal's diadem is the Sayn-Wittgenstein-Berleburg fringe tiara, made by Koch in 1905. Crown Prince Frederik and Crown Princess Mary during a carriage ride to the gala banquet on the occasion of The Crown Prince's 50th birthday at Christiansborg Palace Chapel on May 26, 2018 in Copenhagen, Denmark. Princess Marie of Denmark, who is married to Queen Margrethe's younger son Prince Joachim, wore a glittering blue gown that twinkled nearly as much as her jewelled headpiece, the Diamond Floral tiara. King Carl Gustaf of Sweden and wife Queen Silvia arrive to the gala banquet on the occasion of The Crown Prince's 50th birthday at Christiansborg Palace on May 26, 2018 in Copenhagen, Denmark. Some 350 guest participated in the event Queen Silvia of Denmark arrive to the gala dinner in Copenhagen, Denmark. Some 350 guest participated in the event Crown Princess Victoria of Sweden and husband Prince Daniel arrive to the gala banquet on the occasion of The Crown Prince's 50th birthday at Christiansborg Palace on May 26, 2018 in Copenhagen, Denmark. Some 350 guest participated in the event Queen Margrethe of Denmark (C) holds the birthday speech for Crown Prince Frederik of Denmark at the galla dinner in the Knights Hall on the occasion of the Crown Prince's 50th birthday at Christiansborg Palacel on May 26, 2018 in Copenhagen, Denmark. Some 350 guest participated in the event Queen Margrethe of Denmark (C) holds the birthday speech for Crown Prince Frederik of Denmark at the galla dinner in the Knights Hall on the occasion of the Crown Prince's 50th birthday at Christiansborg Palacel on May 26, 2018 in Copenhagen, Denmark. Some 350 guest participated in the event. Prince Nikolai of Den,arl arrive to the gala banquet on the occasion of The Crown Prince's 50th birthday at Christiansborg Palace on May 26, 2018 in Copenhagen, Denmark. Queen Maxima arrive to the gala banquet on the occasion of The Crown Prince's 50th birthday at Christiansborg Palace on May 26, 2018 in Copenhagen, Denmark. Queen Margrethe of Denmark is lead to her table at The Knights hall where she hoost the Galla Dinner for Crown Prince Frederik on the occasion of his 50th birthday at Christiansborg Palacel on May 26, 2018 in Copenhagen, Denmark. Alexandra Countess of Fredericksborg, former wife of Prince Joachim arrive to the gala banquet on the occasion of The Crown Prince's 50th birthday at Christiansborg Palace on May 26, 2018 in Copenhagen, Denmark. Queen Mathilde of Belgium sparkled in her go-to tiara, the Laurel Wreath. The beautiful piece was made in 1912 and boasts more than 600 diamonds. Princess Benedikte, also wore a fringe style tiara. The royal's diadem is the Sayn-Wittgenstein-Berleburg fringe tiara, made by Koch in 1905. Prince Joachim's ex-wife Alexandra, Countess of Frederiksborg, mother of Burberry model Prince Nikolai, also opted for some serious bling. She wore the Alexandrine Drop tiara, a nuptial gift from her ex-mother-in-law Queen Margrethe II that she had also worn on her wedding day. Crown Prince Frederik's mother Queen Margrethe wore something that we don't often see – a bold gold tiara. The Naasut parure was a gift from Greenland in 2012 for the Danish monarch's 40th anniversary on the throne. Queen Maxima of the Netherlands once again impressed with the Dutch Diamond Bandeau, which features 34 giant-sized gems. Grand Duchess Maria Teresa of Luxembourg wore the heirloom pearl-accented Chaumet tiara, which can also be worn as a choker. Queen Silvia of Sweden seemed to have matched her dress with her beautiful headpiece, the Edward VII tiara featuring diamonds and rubies. The tiara dates back to the early 1900s. Princess Theodora of Greece chose the Antique Corsage tiara to set off her pink gown. The royal, who is also an actress who goes by the stage name Theodora Greece, looked beautiful in the elaborate diamond and pearl headpiece.