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from www.tmz.com – Porn legend Jenna Jameson insists … she was not under the influence when she slammed her car into a pole back in May — pleading “not guilty” today to DUI.

TMZ broke the story … Jameson was arrested after the single-car accident in Orange County May 25th. Cops said she showed signs of intoxication, failed a field sobriety test, and was subsequently busted on suspicion of DUI.

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).

A pretrial hearing has been set for August 16. If convicted, Jenna faces up to a year in jail.