While the royal family and royal fans around the world celebrated the little bundle of joy, spare a thought for George Clooney, who jokes little Archie stole his thunder by being born on the same day as him.
The 58-year-old actor, and close friend to The Duke and Duchess of Sussex, celebrated his birthday on Monday, jokingly telling Entertainment Tonight, "It was a little irritating, because that kid is really stealing my thunder!
"This was my day! I was sharing it already with Orson Welles and Sigmund Freud!," he added.
While he feigned annoyance at having to share a birthday with the royal bub, it was clear he was thrilled for Meghan and Harry, whose wedding he had attended almost this time last year.
"I've very happy," he said about Archie's birth.
"They're a lovely couple, so it's very exciting."
George's wife, Amal, is also incredibly close to Meghan and was one of the guests who attended the Duchess' lavish New York baby shower in February this year.
And with George and Amal living just a half hour drive from Harry and Meghan's new home at Windsor, they're bound to pay each other visits regularly.
George has been incredibly vocal recently, coming to his longtime friend Meghan's defence on several occasions, following the swirling allegations and rumours that had been plastered throughout the tabloids over the past few months.
Speaking to Good Morning Britain in March, George said at the time; "It's a little unfair at times when… I've seen it when the press can turn on you for sort of ridiculous reasons and for almost nothing, and it seemed to me to be a little unjust since she hadn't done anything except happen to live her life," he told the show.
"She's a really kind and smart and intelligent young woman and they're a really wonderful, loving couple.
"Most of it you can just shrug off and not pay attention to, but sometimes it's unkind."
WATCH: George Clooney defends his longtime friend Meghan Markle. Story continues below...
Meghan and Harry's first child was born in the early hours of Monday 6 May and two days later made his world debut during a fleeting press photo call inside St George's Hall at Windsor.
Just hours later the Duke and Duchess announced his name: Archie Harrison Mountbatten-Windsor, via a statement on Instagram, which accompanied a heartwarming image of Archie, cradled by Meghan, meeting The Queen and the Duke of Edinburgh, with Prince Harry, Meghan's mother Doria Ragland, looking on lovingly.
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