The wife of Hanson's Taylor Hanson has given birth to the couple's fourth child. Viggo Moriah Hanson was born on Tuesday.
The couple told People: "Viggo is doing great. He is the perfect early Christmas gift. We look forward to being home to enjoy the holidays with him and his very excited brothers and sister".
Viggo joins Hanson's two other sons, Ezra and River, and daughter Penelope.