Queen Margrethe of Denmark tested positive for COVID-19 on Wednesday after she made an appearance at Queen Elizabeth II's state funeral.
The royal has subsequently cancelled her official engagements for this week, including an evening event on Friday at Christiansborg Castle for the government and the Danish members of the European Parliament.
WATCH: King Charles looks completely heartbroken as royal family sing God Save the King
His Royal Highness the Crown Prince and Her Royal Highness are expected to take her place.
According to the royal court, the 81-year-old has moreover been forced to cancel her planned winter holiday in Norway which she should have started on Wednesday.
The royal, who has reigned for half a century, is reportedly suffering from mild symptoms and is isolating at Fredensborg Castle until she recovers.
The royal was joined by Crown Prince Frederik
Queen Margrethe's health update comes after she made a trip to London to attend the late Queen's poignant state funeral and subsequent committal service at St George's Chapel.
Queen Margrethe II and Crown Prince Frederik were among royals and government leaders from across the world to take part in the historic occasion. The Danish royals were spotted on the front row, directly opposite King Charles III and Queen Consort Camilla.
The Queen's funeral took place at Westminster Abbey
During the moving service, members of the British royal family reunited to honour the Queen and her impressive legacy. Among those attending were the Queen's children – King Charles, Princess Anne, Prince Andrew and Prince Edward – and their partners, the Queen Consort, Vice Admiral Timothy Laurence and the Countess of Wessex.
The Prince and Princess of Wales also attended, along with the Duke and Duchess of Sussex, and the Queen's other grandchildren, Princesses Beatrice and Eugenie, Zara Tindall and Peter Phillips, and Lady Louise Windsor and James, Viscount Severn.
The royal family were dressed in mourning clothes
Following the Queen's funeral, there was a committal service held at St George's Chapel in Windsor. The Service was led by The Right Reverend David Conner, KCVO, Dean of Windsor.
After the prayers and hymns, the Dean of Windsor, will do a Reading of Revelation 21.1-7. Other ministers will read various prayers, including The Lord's Prayer.
Make sure you never miss a ROYAL story! Sign up to our newsletter to get all of our celebrity and royal news delivered directly to your inbox.