Fordham, 37, revealed the happy news on the Channel 9 breakfast show this morning.
"My beautiful wife Jodie who is hopefully watching at the moment, we are 24 weeks, so we are well on the way," he said.
Fordham, who also is a host on 2GB radio, posted a picture on Twitter with the caption: "My amazing wife @JodieSpeers and I are having a baby and we're pretty excited."
It was met with plenty of congratulatory responses from colleagues and fans. The pair married in 2011.