Mike Tindall shared an emotional post on social media to pay tribute to Queen Elizabeth II as his wife Zara travelled to Balmoral to be with the Royal Family.
The former rugby player reposted a photo - originally published by The Sydney Morning Herald - of the Sydney Opera House, with the Queen's image on it.
The Australian newspaper captioned the post: "We are well-used to seeing the Sydney Opera House illuminated to mark significant events, but tonight’s image is above and beyond.
"The sails have been illuminated to pay respect to the late Queen Elizabeth II."
Mike shared the photo on his Instagram stories, adding a red heart to the post.
Meanwhile, Princess Beatrice, Princess Eugenie and Zara Tindall arrived at Balmoral to pay their respects to their late grandmother, Elizabeth II.
They didn't join other royals yesterday but are thought to have arrived today.
During an interview with The Telegraph last year, Mr Tindall - who married the late monarch's granddaughter in 2011 - praised the Queen, describing her as "an amazing woman".
He said: "I can only say how kind they’ve been to me, and how welcoming they’ve been to me since joining the family. And how they’ve made my family welcome.
"I’ve always felt part of it and I think that’s down to what an amazing woman the Queen is. They’re a fantastic family."
Queen Elizabeth II died at the age of 96 at Balmoral Castle yesterday afternoon.
Buckingham Palace made the announcement at 6.30pm, stating: "The Queen died peacefully at Balmoral this afternoon.
"The King and The Queen Consort will remain at Balmoral this evening and will return to London tomorrow."
King Charles and his wife Camilla, now Queen Consort, travelled to London this morning.
The late Queen's son was greeted by crowds outside Buckingham Palace ahead of a televised address to a nation mourning the death of his mother Queen Elizabeth after seven decades on the throne.
Charles and Camilla then looked at flowers and messages left outside the famous black railings, before heading into the palace where the flag of the British sovereign was flown overhead.
Buckingham Palace said there would be a period of mourning to be observed by members of the family and the royal household until a week after the funeral, the date of which has not yet been confirmed but is expected in about 10 days' time.
Charles will officially be proclaimed king on Saturday at a meeting of the Accession Council held at St James's Palace followed by proclamations across the nation.
Following the death of his beloved mother, King Charles III said: "I know her loss will be deeply felt throughout the country, the Realms and the Commonwealth, and by countless people around the world."
He will meet Prime Minister Liz Truss before addressing the country later.
There were gun salutes at London's Hyde Park and at the Tower of London, and the bells at Westminster Abbey and St Paul's as well as the Sebastopol Bell at Windsor Castle, captured during the 19th Century Crimean War, tolled.
Regular business in parliament was replaced with a special session for MPs to pay tribute to the late Queen.
Parliament will also convene on Saturday, something it rarely does, to approve a message of condolence to the King.
* This weekend, the Daily Mirror and Sunday Mirror celebrate the life of Her Majesty the Queen with a commemorative special filled with all the key moments from Britain’s longest reigning monarch. Be sure to pick up your copy of the Daily Mirror and Sunday Mirror to get both pullouts.
