The 48-year-old Bush frontman confirmed they welcomed a baby boy into the world in Los Angeles on Friday (28.02.14), and they decided to include both of their mother's maiden names in the tot's unusual moniker.
He wrote on Twitter on Saturday (01.03.14): ''Welcome Apollo Bowie Flynn Rossdale 2/28/14. Bowie and Flynn = [our] mothers' maiden names.''
The couple also have sons, Zuma, five, and Kingston, seven, together, while Gavin has daughter Daisy Lowe, 25, with ex-girlfriend Pearl Lowe.
The No Doubt beauty, 44, revealed in January that she was expecting another son.
She wrote on Instagram: ''I was ready to hand over the crown. But I guess I am still queen of the house. #itsaboy #surroundedbyboys.''
Gwen was joined by friends, including Gwyneth Paltrow, Kate Beckinsale, Jessica Alba and Nicole Richie, at her baby shower at the Hotel Bel Air on February 8.
The 'Settle Down' singer posted a photograph of a table of blue sweet treats at the event on her Instagram page, with the caption: ''Baby shower!!! #can't believe im pregs thanku Shelli Azoff for a beautiful #girlyday =blessed (sic)''
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