Kingston and Zuma Rossdale sure are growing up fast! We spotted the sons of Gwen Stefani and Gavin Rossdale visiting their grandparents’ house (and looking infinitely cooler than we could ever hope to) in Beverly Hills yesterday. How rockin’ are their hats?  Seriously, the bad assery in these photos is just too much. We’re especially big fans of the Union Jack on Zuma’s bum. Don’t even get us started on his cow shoes.

Kingston, 4 is sporting flip flops showing off his bright red toenails. What do you think – a good idea, or is this look bound to come back and haunt him in twenty years? Tell us in the comments!