The Duke and Duchess of Cambridge have been given a new title following the Queen's death this afternoon.
Kate and William will now be known as the Duke and Duchess of Cornwall and Cambridge.
The change to their title was announced subtly, with a tweak to their name on their social media accounts.
The title Duke of Cornwall was one of many previously held by Charles, before he became King Charles III following the death of his mother the Queen today.
William will likely also acquire another of his father's previous titles - the Prince of Wales. However, this won't happen until Charles bestows the title on him.
William arrived at Balmoral this afternoon, driving his uncles and aunt - Prince Andrew, Prince Edward and Sophie, Countess of Wessex - from Aberdeen airport to the royal estate. Prince Harry arrived separately and Charles, Camilla and Princess Anne were already in attendance.
Kate remained in Windsor to collect their three children - Prince George, nine, Princess Charlotte, seven, and Prince Louis, four - from their first day at their new school near Ascot.
Kate and William haven't yet released their own statement following the Queen's death, but they shared the statement made by Charles.
It read: 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.
The Duke and Duchess of Cornwall and Cambridge isn't the only title the royal couple already hold. William, of course, is also known as Prince William but the pair boast another moniker: the Earl and Countess of Strathearn.
The couple were given the Scottish titles by the Queen on their wedding day. As per royal tradition, senior married royals are given regional titles.
In Ireland, they're known as Baron and Lady Carrickfergus.
Watch: BBC announces HM Queen Elizabeth II has died aged 96