Queen Margrethe has left her royal residence at the Amalienborg Palace surrounded by security as she heads towards Christiansborg Palace for the proclamation of King Frederik.
Princess Mary's husband Prince Frederik will be made King, following on from the abdication of his mother Queen Margrethe.
Margrethe, 83, announced her surprise abdication on New Year’s Eve after more than half a century on the throne, paving the way for Mary to become the first Australian-born Queen.
On the first day of their reign, Mary and Frederik and the entire royal family will participate in the Danish Parliament’s formal celebration of the succession of the throne.
The new King and Queen will also be marked spiritually in a celebratory church service at Aarhus Cathedral on Sunday.