Riddle us this -- if Kim, Khloe and Kourtney Kardashian all go to lunch in the rain, with two sisters expecting but only one of them pregnant ... who drives?
The question's gotta be asked, 'cause the 3 Kardashians found themselves in that exact situation Tuesday as they all grabbed some Italian in Woodland Hills.
It was pouring as they left, and while they certainly had their umbrella handlers -- they didn't have their own driver ... meaning 1 of these ladies got behind the wheel.
Take a guess as to who claimed top dog -- you might be surprised ... or not.