In a picture that is most certainly going to get her a lot of flack, model Gisele Bundchen went on a joyride on a 4-wheeler with her baby. And neither of them wore helmets.

The duo were in Costa Rica on Jan. 12 when they hopped aboard an ATV and went for a ride.

And not only were neither of them wearing helmets, but Bundchen was only driving with one hand so the other one could hold her child.

According to TMZ, it's illegal to drive or ride an ATV on public land without a helmet, but they're not sure whether Bundchen was on private or public property at the time.

Either way, put a helmet on that baby. Better yet, don't drive an ATV while holding a baby!