The country star, 37, and his wife Cassidy will be expanding their brood this fall by welcoming a sibling for big sisters Evalyn Day, 4½, and Jordan Catherine, 2.
And the parents are already planning for being outnumbered.
"So my wife and I will be changing our family defensive strategy come the fall. Switching from MAN-to-MAN to ZONE. #3! Advice @thetimmcgraw?!" Bentley announced on Twitter early Thursday.
He says it's too early to tell whether it's a boy or a girl.