The Duchess of Sussex gives birth to a baby boy
The baby was born at 05:26 BST weighing 7lb 3oz (3.2kg)
Prince Harry says he and Meghan are "absolutely thrilled"
The new arrival is the Duke and Duchess of Sussex's first child
Meghan went into labour "in the early hours" of the morning, the palace said in a statement
Prince Harry was by Meghan's side during labour
The infant, who is yet to be named, is seventh in line to the throne
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Prince Harry has wanted a child "for a long while", says veteran photographer Arthur Edwards, who's been chronicling Prince Harry's life since he was born.
"He's lived next to his brother William, and Catherine, with their children and he's been a great uncle to them but now he's got his own son, I mean, he'll just be, he'll be so excited," Mr Edwards says.
Tony Appleton is known for his unofficial announcements of royal births. He was seen outside St Mary's hospital in Paddington following the births of Prince George, Princess Charlotte and Prince Louis.
He's been seen today in Windsor celebrating with people outside the castle.
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Earl Spencer tweets:
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Toronto Mayor John Tory has congratulated the Royal couple on the birth of their son.
"Great to hear mom and baby boy are doing well and we look forward to the family’s next visit to Toronto," he said on Twitter.
The Duchess of Sussex lived in the Canadian city for several years while working on the US TV series Suits.
Prince Harry and Meghan also made their first public appearance together there during the Invictus Games in 2017.
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Thomas Markle, the Duchess of Sussex's father, says the new baby "will grow up to serve the Crown and the people of Britain with grace, dignity and honour", .
Mr Markle claimed in December his daughter was "ghosting" him following her marriage to the duke.
The Â鶹ԼÅÄ's Helena Wilkinson is in Windsor and says the town is getting "very busy".
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Prince Harry has said he and Meghan have not yet decided what to call their son. But what rules are there around baby names?
What can't you name your baby?
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Â鶹ԼÅÄ royal correspondent Nicholas Witchell says Prince Harry "really, really wanted to start a family".
Royal baby: 'Harry was a little jealous of his brother'
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The BT Tower in central London broadcasts the news...
Royal baby: BT Tower lights up for baby boy
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Crowds have begun to gather near Windsor Castle this afternoon.
The duke and duchess's home, Frogmore Cottage, is in the grounds of the Berkshire estate, west of London.
Â鶹ԼÅÄ royal correspondent Nicholas Witchell says it is likely Meghan did give birth at home.
Helena Wilkinson reports from outside the castle: "Windsor is getting very busy.
"There was a group of people just a few minutes ago - on hearing that the baby had been born - erupted in applause. Just a bit further from where we are a lot of people are now gathering.
"There's a corner, not too far away from me just off the main street, where a lot of the royal fans tend to gather.
"Over the past couple of days somebody, rather prematurely, put a couple of banners up there: one of them saying 'congratulations on the birth of your baby girl', the other 'congratulations on the birth of your baby boy'."
Image source, Reuters
Image source, Reuters"Seclusion", wrote former British Prime Minister Lord Salisbury, "is one of the few luxuries in which royal personages may not indulge".
So what's going on with the birth of the Duke and Duchess of Sussex's first child?
Read this piece by Â鶹ԼÅÄ royal correspondent Jonny Dymond, who tries to work out whether the couple will choose privacy or publicity for their baby.
The new baby is the seventh in line to the throne. His father, Prince Harry is sixth in line.
The latest addition to the Royal Family is Prince Charles' fourth grandchild and the Queen's eighth great-grandchild.
You can see the full Royal Family tree and line of succession here.
The youngest generations of the royal line
President of Israel tweets...
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Nicholas Witchell
Â鶹ԼÅÄ royal correspondent
"I think he [Prince Harry] has really relished and anticipated this moment. I think he has really, really wanted to start a family.
"He's good with children - he's good with people - but I think he has a distinctive affinity with children.
"I think actually he's been a little bit jealous perhaps of his brother, who now of course has three, and I think he's been rather keen to catch up or to start his own family."
Archbishop of Cantebury, Justin Welby, tweets:
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Scotland's first minister tweets:
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The prime minister tweets:
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Buckingham Palace tweets:
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