Prince Harry and Meghan Markle have announced the birth of their baby son.
The Duke of Sussex was at his wife's side after she went into labour in the early hours of Monday morning.
A Buckingham Palace statement on Monday afternoon said: "Her Royal Highness The Duchess of Sussex was safely delivered of a son at 0526hrs.
"The baby weighs 7lbs 3oz.
"The Duke of Sussex was present for the birth.
"The Queen, The Duke of Edinburgh, The Prince of Wales, The Duchess of Cornwall, The Duke and Duchess of Cambridge, Lady Jane Fellowes, Lady Sarah McCorquodale and Earl Spencer have been informed and are delighted with the news.
"The Duchess's mother, Doria Ragland, who is overjoyed by the arrival of her first grandchild, is with Their Royal Highnesses at Frogmore Cottage.
"Her Royal Highness and her child are both doing well."
The name of the baby, which is seventh in line to the throne, will be announced at a later date.
Speaking from Windsor, a beaming Duke of Sussex said: "I'm very excited to announce that Meghan and myself had a baby boy this morning, a very healthy baby boy.
"It's been the most amazing experience I could ever have possibly imagined.
"How any woman does what they do is beyond comprehension. But we're both absolutely thrilled.
"We're both absolutely thrilled and so grateful for all the love and support from everybody out there, it's been amazing, so we just wanted to share this with everybody."
The baby will be seventh in line to the throne and the Queen and the Duke of Edinburgh's eighth great-grandchild.
Ahead of the birth the duke and duchess made a personal decision to keep their arrangements private amid speculation they had opted for a birth at their new home, Frogmore Cottage, close to the Queen's Windsor Castle home.
They had said they will only share the news of the baby's arrival once they have had a chance to celebrate privately as a family.
The newest addition to the Windsor family will be a first cousin of the Duke and Duchess of Cambridge's children, Prince George, Princess Charlotte and Prince Louis, and a fourth grandchild for the Prince of Wales.
The happy news comes less than a year after Harry married American former actress Meghan in a glittering ceremony in St George's Chapel, Windsor Castle.
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