Ben Affleck is playing chauffeur for the missus on their tropical end-of-year vacay -- driving Jennifer Lopez around in a teeny tiny vehicle that he definitely looks too big to be in.
Hubby was behind the wheel Friday in a Mini Moke -- which is basically a toy Jeep for adults -- while cruising around St. Barts with his wife riding passenger ... and like we said, BA seems to be a bit crammed in there, even though Jen's enjoying the ride
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