The proud parents made the announcement via Twitter.
Earlier this year, the 44-year-old No Doubt singer revealed she was expecting yet another boy. "I was ready to hand over the crown. but I guess I am still queen of the house. #itsaboy #surroundedbyboys" she said on Instagram.
Stefani and Rossdale have been married for 11 years, and are already parents to sons Kingston, 7, and Zuma, 5.