Gwen Stefani and Gavin Rossdale welcome baby boy

Gavin Rossdale and Gwen Stefani attend PANDORA Jewelry and Moto X present 'American Hustle' at cinema prive at on Nov. 30, 2013, in West Hollywood, Calif.
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Gwen Stefani and Gavin Rossdale have added another boy to their family.

The No Doubt frontwoman gave birth to a son on Friday. Rossdale announced the news Saturday via Twitter. Their new addition is named Apollo Bowie Flynn Rossdale -- Rossdale says Bowie and Flynn are his and Stefani's mothers' maiden names.

Stefani, 44, and Rossdale, 48, already have two boys: 5-year-old Zuma and 7-year-old Kingston.

The couple have been married since 2002.