Patrick Kielty and Cat Deeley have announced the birth of a baby boy.
Deeley said she was "beyond delighted", adding that the pair "couldn't be happier" after the birth last week.
The television presenter tweeted: "Beyond delighted to announce the birth of our baby boy last week. All doing well & we couldn't be happier... 3 really is the magic number!"
The 38-year-old married the Co Down comedian in September 2012.
Kielty had previously joked about having children with Deeley, saying: "I hope any child we might have has Cat's looks and my accent. With our two strong accents, we basically needed subtitles or a UN translator."
Kielty said last year that he and his wife may have to reconsider where they live when their child is born.
At present the he spends most of his time in California, where Cat is presenter of hit US TV show So You Think You Can Dance.
Beyond delighted to announce the birth of our baby boy last week. All doing well & we couldn't be happier... 3 really is the magic number!— Cat Deeley (@catdeeley) January 19, 2016
But the 44-year-old quipped that he wasn't sure he wanted to raise the couple's firstborn among the "hippy-dippy" people of the Golden State, and fears life might be "rubbish" after it's born.
"You have a lot of hippy-dippy people out there. Quite a lot of Americans who don't have any answers and don't know what they're doing head west, and then they get to the point where they reach the (Californian) beach and can't really run any further," he said on talkSPORT in September.
The Dundrum native added: "I thought to myself: 'I've got myself out of a small village in Northern Ireland and spent a bit of time on the beach in California'.
"My life was happy, and you're going to have a kid there and your life is going to be rubbish."
Kielty's rather tongue-in-cheek assessment of the Californian lifestyle clearly differs from that of Cat, who told Closer magazine: "We're going to ensure we take the baby back home to visit our families as much as possible but, for now, we're happy here in Los Angeles and are excited to bring up our child with an outdoors lifestyle.
"They're going to experience the LA sunshine Patrick and I never got to experience."