The "Give Me Back My Hometown" singer, 37, hinted at his happy news this week during a stop on his ongoing Outsiders World Tour. Eric was performing his 2006 single "Sinners Like Me" in Louisville, Ky., on Thursday, Sept. 25, when he altered the lyrics to the song to reflect his growing family.
While the original lyrics read, "Well now maybe who knows one day I'll settle down / Give my dad a grandson of his own," CMT.com reports that Eric shouted out the second line, adding, "Give my dad another grandson!"
The expectant couple welcomed their first child, son Boone McCoy, in October 2011, after they tied the knot in January 2008.
"When you have a child, everything changes," Eric told Rolling Stone this past June. "I've changed a lot. I suppress a lot of maybe the way I used to be. Is that dark side still probably there? Yeah. I just don't let it come out very much. But if you mess with my kid, if you mess with my family, well, I can bring it out."