The long-reigning monarch handed over the role of sovereign to her son, who becomes the nation's new sovereign, Euronews reports.
Denmark has a new king, as the nation's prime minister proclaimed Frederik X as the monarch.
His mother, Queen Margrethe II, signed her historic abdication on Sunday - a step that made her son Frederik X immediately become king.
Massive crowds turned out to rejoice in the throne passing from a beloved monarch to her popular son.
Margrethe, 83, is the first Danish monarch to voluntarily relinquish the throne in nearly 900 years. Many thousands of people gathered outside the palace where the royal succession was taking place, the mood jubilant as the Nordic nation experienced in first royal succession in more than a half-century - and one not caused by the death of a monarch.
