The littlest Hanson, Zac and his wife Kate welcomed their third child on Thursday.
Drummer for the all-brother band, Hanson already has a five-year-old son, John Ira Shepherd, and two-year-old daughter, Junia Rosa Ruth.
"We are very excited to share the addition of George Abraham Walker Hanson to our growing family," he said. "Abraham is healthy and we are happily sharing a little down time together as a family."
The boys have been on the road to promote their latest album, Anthem, but are slowing things down to focus on family.