Jenna Jameson Pleads Guilty To DUI Charge

TMZ broke the story ... Jameson was arrested after a single-car accident back in May in Orange County -- and was subsequently charged with DUI ... drugs and alcohol.

Jenna was also charged with driving without a valid license -- but that count was dropped today in exchange for her guilty plea.

According to law enforcement, Jenna blew a .13 and had two prescription drugs in her system at the time of her arrest -- zolpidem (Ambien) and buprenorphine (Suboxone).