But who's who and how does it all fit together? Our handy family tree will help you work out the family connections.
What does the royal family tree look like?
Well there's no point talking you through it. Take a look for yourself.
Sitting pretty at the top of the pile are King George V and his wife the Queen Mother.
The family chart follows all the way through the generations, through the Queen, her children – including Charles – to Princes William and Harry and on to Wills' kids with Kate.
Added to the final generation are the most recent additions to the family – Prince Louis and Zara Tindall's second child Lena.
When is Baby Sussex due?
Kensington Palace confirmed the news of the pregnancy on October 15, 2018.
The Palace also confirmed that the baby is due in April 2019 – but no exact date was given.
Where will Baby Sussex sit in the line of succession?
The throne will pass to Prince Charles if the Queen abdicates, retires or dies – and according to reports, abdication could be a real possibility.
Her Majesty is said to have told her inner circle that if she is still on the throne at the age of 95, she will ask for a piece of legislation to grant her eldest son full power to reign while she is alive.
Royal commentator Robert Jobson told the Mail On Sunday he has spoken to a number of high-ranking courtiers who say preparations for the transition of the Crown are gaining pace.
And at this year's Commonwealth Heads of Government meeting, The Queen said she wished for Charles to succeed her as head of the group of countries.
Next in line after Charles is eldest son Prince William, the Duke of Cambridge, and then his children, Prince George, Princess Charlotte and the new baby boy, Prince Louis.
Prince Harry – who was third in line to the throne in 2013 – is now sixth in line.
Meghan and Harry's baby will be seventh in line to the throne.
Prince Andrew, the Duke of York, is bumped down the line to eighth.
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