Meghan, who was a week overdue, gave birth at 05.26am on Monday morning with Prince Harry by her side and their baby weighs 7lbs 3oz.
Taking to their official Instagram page, the couple wrote: "We are pleased to announce that Their Royal Highnesses The Duke and Duchess of Sussex welcomed their firstborn child in the early morning on May 6th, 2019. Their Royal Highnesses’ son weighs 7lbs. 3oz"
Shortly after the announcement, Prince Harry stepped out at Windsor Castle to give an impromptu and heartfelt statement about the birth of his first child.
Clearly over the moon, Prince Harry said: "Mother and baby are doing incredibly well. It’s been the most amazing experience I could of ever possibly ever imagined. How any woman does what they do is beyond comprehension! We are both absolutely thrilled and so grateful for all the love and support from everyone out there. It's been amazing so we just wanted to share this with everybody.
"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."
Asked if they had any names yet, he said: "Still thinking about names. The baby is a little bit overdue, so we've had a little bit of time to think about it.
"That's the next bit, but for us I think we will be seeing you guys in probably two days' time as planned as a family to be able to share it with you guys and so everyone can see the baby."
The couple have kept details of their pregnancy fairly under wraps, with Harry and Meghan’s household recently saying in a statement: “The Duke and Duchess of Sussex are very grateful for the goodwill they have received from people throughout the United Kingdom and around the world as they prepare to welcome their baby.
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“Their royal highnesses have taken a personal decision to keep the plans around the arrival of their baby private.
“The Duke and Duchess look forward to sharing the exciting news with everyone once they have had an opportunity to celebrate privately as a new family.”
Meghan had a surprise baby shower back in New York earlier this year and the five-day trip included a spot of shopping, eating her favourite foods, and a baby shower with 15 of her closest friends. The surprise trip was organised by her best friend and stylist, Jessica Mulroney.
While we didn't get any major updates from the couple, their friends and family provided snippets of information, including Serena Williams who gave us an insight into how Meghan was coping with her pregnancy.
Speaking to at the launch for her Serena clothing line launch in Miami, she said: "I'm like, 'How are you?' and she’s like, 'No, how are?' and I’m like, 'You’re so sweet, but I’m really asking – how are YOU?'.
"I’m like, 'Meghan, stop being so nice… you’re the pregnant one, aren’t you supposed to have hormones, why are you so sweet?' But that’s always been her."
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A source told the paper: "Amal and Meghan have been close for years, and Harry and George have become buddies because of that. They're much closer than the headlines let on."
Apparently, George "told a couple of people he has a strong hunch" that they'll be asked to be godparents.
We're really hoping his 'hunch' is accurate and only time will tell.
We'll keep you updated with all the updates as and when we know.
Welcome to the world, little one!