Jenna Jameson Sued -- Give Our Maserati Back!!!

Jenna Jameson is currently driving around in a stolen Maserati -- this according to the company that leased it to her ... and now, it's suing to get the car back.

Maserati Financial Services filed the lawsuit against Jenna in Orange County Superior Court, claiming it leased a Maserati Quattroporte S to the porn legend back in 2010 for $2,299 a month -- but Jenna stopped paying in January.

MFS says it's been trying to repossess the car to no avail -- so now it's going after Jenna in court, demanding she return the vehicle ASAP ... AND pay $107,000 in damages.