Jennifer Lopez's New BF Casper Smart -- Suddenly Driving a BENTLEY

Banging Jennifer Lopez has some HUGE perks ... (besides just banging Jennifer Lopez) ... TMZ has learned her new boy toy is now driving around town in the pop star's pimped out BENTLEY!!!

Sources close to Casper Smart tell us ... the world's most famous backup dancer isn't just using the car to chauffeur his meal ticket around when she's in L.A. ... he gets the car for personal use too.

Besides car privileges ... dude has already flown across the world on a private jet ... gone on tropical vacations ... and as we previously mentioned, he gets to bang J.Lo.