May 27, 2011 11:00 AM

Juan Sharma/Miguel Aguliar/Pacific Coast News

Happy birthday Kingston!

Gwen Stefani and her eldest son — who turned 5! — strut their stylish stuff in L.A. on Thursday.

The No Doubt frontwoman, 41, husband Gavin Rossdale and their boys are just back from France, where Stefani made fashionable appearance after fashionable appearance at the Cannes Film Festival.

RELATED GALLERY: Kingston Rossdale: Happy 5th Birthday!

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