Former Westlife star Kian Egan and his wife Jodi made the announcement via an adorable video on Facebook.
The couple enlisted the help of their son Koa to reveal the news.
On Kian’s official Facebook page, he shared a video of his 3-year-old son making an important announcement.
Dressed in his snug onesie, the youngster told viewers that his “mummy has a baby in her tummy” and he is “going to be a big brother”.
Kian (34) and Jodi (31) married in May 2009, welcoming son Koa in December 2011.
The family are currently based in Strandhill, Co Sligo.
Former Hollyoaks actress Jodi recently spoke out about her battle with post natal depression.
“I was so happy with this beautiful baby, I would look at Koa and I was so euphoric and so happy, but at the same time I didn’t like myself which was very strange,” she said.
The one-time girlband member also said that she “went through a lot” while pregnant with her son.
“Westlife ended, Wonderland ended, a few friends left our lives, and my mum was sick so there was a lot of change during that time.”
Jodi believes that she suppressed her feelings while pregnant, but when Koa arrived she was forced to face her emotions.
“I was just on autopilot, and I felt ashamed. I felt people might think I wasn't a good mum,” she reflected. “Once I recognised what it was I was able to get help and talk about it.”
The London native credited her “superman” husband for his unfailing support and also attended therapy sessions to come to terms with her mental health.
Jodi and Kian have been together for eleven years.