The Australian-born royal, 52, looked wonderful in a glittering midnight blue gown by Jesper Høvring, featuring an asymmetric top and a reworked satin tiered skirt.
The ensemble was first seen a decade ago at Bambi Awards and has been remodelled several different ways since, including an additional velvet overlay for the annual New Year's banquet in 2016, and in its full glittering glory at her son Crown Prince Christian's 18th birthday dinner last year.
The thrifty queen is no stranger to an upcycle and frequently wears pieces from her wardrobe dating back to her early royal years.
The star of the show was the Danish royal's tiara. Queen Mary wore the Pearl Poire tiara which dates back to 1825 when it was commissioned as a wedding gift from King Frederich Wilhelm III of Prussia to his daughter, Princess Louise, upon her marriage to Prince Frederick of the Netherlands
Mary wore it with the Antique Diamond Parure and earrings - a collection of jewels that became synonymous with her mother-in-law, Queen Margrethe, during her 52-year reign.
King Frederik looked dapper in military uniform while the evening's special guest President Halla Tómasdóttir looked lovely in a gold embellished gown.
Queen Mary's terrific tiaras
The royal mother of four has worn many beautiful heirloom tiaras in her time - both before and after she ascended the throne in January upon the abdication of Queen Margrethe .
In May, she looked utterly dreamy in a lavender look fit for a fairytale. Mary attended a state dinner during her and Frederik's visit to Norway where she wore a stunning Birgit Hallstein dress with delicate tulle sleeves and a cinched waistline.
The lovely lilac piece was teamed with the Pearl Poire tiara - making its debut on Queen Mary.
Earlier in the month the royal opted for a deeper shade of purple as Crown Princess Victoria and Prince Daniel welcomed King Frederik and Queen Mary into Stockholm Palace during their two-day state visit to Sweden.
Mary wore an ethereal gold top and skirt combo from Jesper Hovring with climbing florals up the bodice to tie in with her Ruby Parure tiara, earrings, necklace, brooch, and bracelet.
The 200-year-old diadem was crafted in 1804 for Désirée Clary Bernadotte (later Queen Desideria of Sweden) ahead of Emperor Napoleon's coronation.
Queen Mary wowed in the Edwardian Tiara as she styled out a gold and pale blue gown.
ROYAL FAN? JOIN THE CLUB
Welcome to The HELLO! Royal Club , where thousands of royal fans like you get to delve deeper into the wonderful world of royalty every day. Want to join them? Just click the button below for a list of club benefits and joining information.
Get updates delivered to you daily. Free and customizable.
It’s essential to note our commitment to transparency:
Our Terms of Use acknowledge that our services may not always be error-free, and our Community Standards emphasize our discretion in enforcing policies. As a platform hosting over 100,000 pieces of content published daily, we cannot pre-vet content, but we strive to foster a dynamic environment for free expression and robust discourse through safety guardrails of human and AI moderation.
Comments / 0