There's another baby on the way for the country crooner and his wife Heather, his rep confirms to PEOPLE. In addition to the couple's 20-month-old daughterDylan River, Nichols is also dad to Ashelyn, 15.
"Joe, Heather and Dylan are very excited to be welcoming a new baby by summer," his rep tells PEOPLE.
Nichols, 37, announced the news Thursday on Twitter.
"Aaaaaaand we're pregnant again! Another baby Nichols on the way in 2014!" he wrote.
This is especially happy news as the couple, who have been married since 2007, has been open about their difficulty carrying a baby to term. Heather suffers from an auto-immune condition which led to five miscarriages before fertility treatments and a number of specialists helped her to successfully deliver Dylan.