Zac & Kate Hanson: Mary Lucille
Credit: Dave M. Benett/Getty

Zac Hanson officially has a family of six! The 30-year-old musician welcomed his fourth child with his wife of 10 years, Kate Hanson, Saturday in his hometown of Tulsa, Okla.

"We are overjoyed to share the arrival of Mary Lucille Diana Hanson," Zac told People, adding that their daughter weighed 8 lbs., 4 oz. and will go by Lucille. "It is such an inspiration to meet her and to imagine all of the adventures we will take together as a family of six." The baby girl joins siblings John Ira Shepherd, 8, Junia Rose Ruth, 5½, and George Abraham Walker, 2½.

Zac is just the latest of the Hanson brothers to expand his family. His 35-year-old brother Isaac, already has three children, James Monroe, 8, and Clarke Everett, 9, and Nina Odette, 2, and Zac's 33-year-old brother has five children—Jordan Ezra, 13, Penelope Anne, 11, River Samuel, 9½, Viggo Moriah, 7½, and Wilhelmina Jane, 3½.

Considering the Hanson brothers grew up in a family of seven children, it's not surprising that they all wanted big families of their own.

Congrats, to the happy family!