Sources confirmed the exciting baby new to Entertainment Tonight. The newest addition joins Jamie and Amelia’s little girl, two-year-old daughter, Dulcie.
The insider revealed that the proud parents welcomed their darling bub in London.
The couple are yet to confirm any details of the birth; last time they waited one month after their daughter was born in November 2013 to announce her arrival.
The 33-year-old Irish actor and Amelia have been married for nearly three years after they tied the knot in April 2013.
"I love fatherhood," the proud dad told British Vogue in February 2015. "These last couple of years have been quite something. But we're enjoying it."
That same month, he admitted to the UK’s Stylist that it was a "mad situation" when Amelia went into labour the first time.
"My father has delivered over 6,000 babies, my stepmother's an obstetrician gynecologist and I've been around a lot of baby talk in my life. But still, nothing actually prepares you," he said at the time.
"I hope I'm a good dad. It's the most joyous thing imaginable. It's totally changed our lives but only for the positive."
"People are so f--king down about having kids - in those early months when people are saying, 'Say goodbye to sleep.' Well, of course! You've got a baby!" Jamie continued.
"But I'm like, 'Embrace it! Don't listen to all the people who are down on it, because it's only good.'"
Meanwhile, it’s back to work for the new father-of-two.
He was spotted on the Vancouver set of the film of the Fifty Shades of Grey sequel, Fifty Shades Darker, reprising his role as billionaire Christian Grey, while Dakota Johnson, 26, will be reprising her role as his lover, Anastasia Steele.
The movie is expected to hit cinemas in February 2017.