Florida Georgia Line’s Tyler Hubbard and wife Hayley welcomed their third child—a baby boy named Atlas Roy Hubbard—on Sept. 24, according to People. Atlas weighed 8 lbs., 2 oz., and measured 21 inches long. Atlas joins big sister, Olivia, 2, and big brother, Luca, 13 months, in the Hubbard household. Tyler and Hayley were married…