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from www.TMZ.com – Porn legend Jenna Jameson just pled “guilty” to DUI — but the good news for her … she won’t face any jail time.

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).

Jenna was sentenced today to 3 years informal probation — and was ordered to participate in a 3-month alcohol education program, as well as the MADD (Mothers Against Drunk Driving) program in O.C.