The couple's new son, Atlas Roy Hubbard, was born in Nashville on Thursday (Sept. 24), weighing in at 8 lbs., 2 oz., and measuring 21 inches long.
"We are so excited to have Atlas here! It's been an amazing journey and we are feeling so thankful," the Hubbards told People. "Having three under 3 was not our plan but clearly it was God's plan, and now we can't imagine it any other way. Liv is so excited and ready to meet her baby brother."