The sad death of the Queen means the Royal Family's line of succession has changed.
Charles is now King, Prince William is heir to the throne and his son Prince George is now second in line.
And these changes have also brought about an important new role for Princess Beatrice - one of the Queen's beloved granddaughters.
Before the Queen died, Charles, William, Prince Harry and Prince Andrew were Counsellors of State, which meant they could step in if the monarch was unable to perform her duties "due to illness or absence abroad".
By law, Counsellors of State are the top four people in the line of succession who are over the age of 21 as well as the monarch's spouse.
For the latest updates as the world mourns the Queen and King Charles III's reign begins, follow our live blog.
Now Charles is King, it now means the Counsellors of State are William, Harry, Andrew, Queen Consort Camilla and the next person in line over the age of 21, which is Beatrice.
According the the Royal Family website : "Counsellors of State are authorised to carry out most of the official duties of the Sovereign, for example, attending Privy Council meetings, signing routine documents and receiving the credentials of new ambassadors to the United Kingdom."
However, they cannot be delegated Commonwealth matters, create peers, appoint a Prime Minister or dissolve Parliament - unless it is the monarch's express instruction.
Beatrice was one of the Queen's eight grandchildren and the mum-of-one has always spoken sweetly about her grandmother in the past.
Growing up, Beatrice and her younger sister Princess Eugenie were believed to be very close to the Queen - and only lived a short drive from Windsor Castle.
In a Hello interview Beatrice once said: "I find my grandmother inspiring every day because her overwhelming sense of duty is linked with an overwhelming curiosity.
“Every day she’s curious to learn something new, to do something new ... she goes out into the community with a genuine curiosity as to how she can be a force for good in the world."
However, the biggest indication of the sweet bond between granddaughter and grandmother came in July 2020 - on Beatrice's wedding day.
Beatrice wed husband Edoardo Mapelli Mozzi in a scaled back ceremony due to strict Covid restrictions at the time.
The Queen and Prince Philip were among the small number of guests - and for the big day, Beatrice wore a dress straight from the Queen's wardrobe.
The dress was designed by Norman Hartnell, with the Queen having worn it to several glitzy occasions in the 1960s.
You can leave your tributes to Queen Elizabeth II here
