Quit smoking ... get a brand-new Maserati???
That's the deal Josh Donaldson made with his mom ... and when the MLB superstar paid up his side of the bet with the $70,000 whip -- Momma Donaldson's reaction was PRICELESS!!!
The Atlanta Braves stud says he made the pact with his mom a couple of years ago ... saying if she cut out cigarettes, he'd deliver a pricey ride as a present.
Well, sometime recently, she reached the two-year clean mark ... so he filmed himself giving her the Maserati, and the footage is amazing.