Prince Harry and his wife Meghan, the Duchess of Sussex, are the proud parents of a new baby boy.
The baby, who has not yet been named, is seventh-in-line for the British throne and is Queen Elizabeth II's eighth great-grandchild.
It is the first child for Harry and Meghan, who married a year ago. Harry spoke before cameras on Monday afternoon, saying they were "absolutely thrilled" as he thanked the public for their support during the pregnancy.
He said Meghan and the baby were doing "incredibly well," adding that they were still thinking about names for the infant, who was delivered at 05:26 BST.
Buckingham Palace said the baby weighed 7lbs 3oz (3.2kg), and that the duke was present for the birth.
The duchess is a 37-year-old retired US actress formerly known as Meghan Markle. The 34-year-old prince is the son of Prince Charles — next in line for the throne — and Princess Diana, who died in a Paris car crash in 1997.
Harry has long spoken of his desire to start a family.
Other hotly tipped names included Ivy, Grace and Alice.
Some British bookmakers stopped taking bets last week on when the baby would be born, believing that it had already secretly arrived.
Meghan was a popular US actress before marrying Prince Harry last May at Windsor Castle. She has been hailed as a breath of fresh air in a stuffy institution, yet she has been heavily targeted for criticism by sections of the British media.
Speaking after the birth, Harry added the child had been "a little overdue" and that he planned to make another announcement in two days' time "so everyone can see the baby".
Asked what it was like to be present for the birth, he laughed and said: "I haven't been at many births. This is definitely my first birth. It was amazing, absolutely incredible, and, as I said, I'm so incredibly proud of my wife.
"As every father and parent will ever say, you know, your baby is absolutely amazing, but this little thing is absolutely to-die-for, so I'm just over the moon."
He added: "It's been the most amazing experience I could ever have possibly imagined.
"How any woman does what they do is beyond comprehension."