Gwen Stefani & Her Beverly Hills Boy

Gwen Stefani was spotted with her son Kingston, who turns 3 next month, leaving a medical building in Beverly Hills, CA on Friday.

In a radio interview, Gwen revealed her elder son's taste in music: “He likes hits, he's like his mom, he likes just all the hits. Any song that comes on, he'll get ****, if you turn the station. He'll be like, ‘That's my song, that's MY song!’ He's really into anything that's popular and he's really into Britney's songs. Really, a lot. He's really into her. Because she actually lives on my street and he would go over there(...) He thinks she's really great. And he flirts with her and stuff. He's just into popular music. He's into music that's for sure.”

Gwen, 39, and her husband Gavin Rossdale, 43, are also parents to 8-month-old son Zuma Nesta Rock.