"I also want to thank those of you who are staying at home," the Queen, 93, said.
Queen Elizabeth II faces months without horse riding due to social distancing rules but will be exercising, her former press secretary says.
The 71-year-old, who is heir to the British throne, spent seven days in quarantine at his home on the Balmoral estate in Scotland.
The Duchess of York tweeted that "Mother Nature has sent us to our rooms.. like the spoilt children we are."
Charles is understood to have spoken to his mother and both his sons, Prince William and Prince Harry, since his diagnosis.
The 71-year-old, who is first in line to the British throne, has "been displaying mild symptoms but otherwise remains in good health," a Clarence House spokesperson said.
The 93-year-old monarch left Buckingham Palace a week earlier than planned and was joined at Windsor Castle by husband Prince Philip.
Buckingham Palace said the 93-year-old monarch would be leaving London a week earlier than planned and will stay at Windsor until beyond the Easter period.
Peter and Autumn Phillips said the decision is the "best course of action for their two children and ongoing friendship."
Phillips, a non-working member of the royal family, like Meghan and Harry soon will be, is seen drinking a glass of milk in the television advert.
Duke of Sussex and British prime minster both attended the UK-Africa Investment Summit in London.
Steve Hilton said he was "sick" of hearing about the royal family after Prince Harry's first public address since the announcement that he and wife Meghan will no longer be working royals.
Buckingham Palace announced the Duke and Duchess of Sussex will stop carrying out royal duties from the spring and will no longer use their HRH titles.
The queen is pushing to resolve the issue in "days, not weeks," said Buckingham Palace.
"I just have such respect for the Queen," the president said on Fox News. "I don't think this should be happening to her."
The Duke and Duchess of Sussex shared a new picture of their son Archie along with a video of their 2019 highlights to mark the start of 2020.
The queen also noted America's historic Apollo 11 space mission to land on the Moon in this year's speech highlighting the importance of "small steps" in making progress.
The queen's Christmas speech has been televised since 1957.
Prince Andrew's disastrous interview about his relationship with Jeffrey Epstein highlighted the challenges facing the 93-year-old queen. What happens to the British monarchy after Elizabeth?
Congratulations for making it to the final Democratic debate of 2019.
Emily Maitlis, who spoke to Prince Andrew on Thursday, said the royal got permission for the interview from the highest person in Buckingham Palace—his mother, the queen.
The royals and their son Archie are expected to spend Christmas with Markle's mother, Doria Ragland.
The Queen has approved the prorogation of parliament on the advice of her prime minister, Boris Johnson.
A senior civil servant was awarded £10,000 (about $12,000) compensation because he was "offended" by the portraits in July.
Pictures were hung up of leaders that President Donald Trump has met so far this year.
The successful candidate will have the Cambridge's hectic diary at their fingertips.
"It's not harmless, it's not powerless," anti-monarchy campaigner Graham Smith told "Newsweek."
Each year, a slew of financial documents give the public a glimpse into royal spending.
The duke, husband, future king and father-of-three has had an eventful life so far.
The Instagram snapshot is the first close-up to depict baby Archie and arrives along with new details about the upcoming christening.