Irish singer Ronan Keating has become a dad for the fourth time after his Australian wife Storm gave birth to a boy.

The Boyzone star announced the couple's happy news on Instagram, alongside an adorable snap of Storm holding their son.

"Incredibly excited to announce the arrival. We're all bursting with love for the newest little member of our family! Feeling very blessed to be daddy to this little man and the luckiest man in the world to be husband to such a strong, loving and warm-hearted woman and add to my beautiful family #KeatingClan," Ronan wrote.

It is the couple's first child together. They haven't yet revealed the tot's name.

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Ronan is already a father to children Jack, 17, Missy, 15 and Ali, 11, from his first marriage to Irish model Yvonne Connolly.

His marriage crumbled after Ronan's affair with a backing singer in 2009 was exposed.

(L-R) Ali Keating, Ronan Keating and Storm Keating attend a dinner. Photo / Getty
(L-R) Ali Keating, Ronan Keating and Storm Keating attend a dinner. Photo / Getty

He met Storm on the set of Australian X Factor in 2010, where he was a judge and she was the show's producer.

After they tied the knot in August 2015, Ronan said: "I'm happier than I've ever been. Storm makes me feel secure. It's very refreshing. I haven't had that before.

"I've always had to work to feel reassured, to feel secure, and that's not nice because you don't know where you stand.

"I put up a front to make people think I had all of this confidence in myself, which I didn't. I've always been quite an insecure person."

The Keatings split their time between Sydney and Ronan's native UK. Ronan was in Australia earlier this month to perform at the races in Randwick and film a quick cameo for Nine Network drama Love Child.

 Singer-songwriter Ronan Keating and Storm Keating enjoying Ladies Day at Royal Ascot Racecourse. Photo / Getty
Singer-songwriter Ronan Keating and Storm Keating enjoying Ladies Day at Royal Ascot Racecourse. Photo / Getty

"It's a character that's been in the storyline for quite a few seasons but you've never actually met him before. So brand new character really on your screens, but he's been there in history," Ronan told Today presenters Karl Stefanovic and Lisa Wilkinson last month about his acting gig.

Ronan was last on Australian screens as a coach on The Voice in 2016 and before that as a judge on Australian X Factor from 2010-2014.

He's also acted before including in Australian film Goddess, which also starred Magda Szubanski.