'Blow' Star Jennifer Gimenez's Valiant Effort to Get George Jung Clean

Jennifer Gimenez came off the set of "Blow" as an addict, but turned herself into a rehab guru -- and says she would've helped George Jung get clean too ... if he wanted it.

The actress, who starred in the film about the famous drug smuggler, tells us she got word from someone in George's camp last year telling her he was drinking a lot ... and they were worried he'd get busted if he didn't get treatment.

Watch -- it sounds like the wheels were in motion, but then came to a hard stop when George got busted last week for a parole violation.