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Jenna Jameson can add another DP to her credits … as in “don’t prosecute” … ’cause TMZ has learned the XXX legend WILL NOT be hit with charges for allegedly attacking a transgender porn star Saturday.

Law enforcement sources tell us … the Orange County District Attorney’s Office has decided there just ain’t enough evidence to convict Jameson of battery … so the case is essentially dead.

We broke the story … 39-year-old Jenna was originally cited for battery after allegedly using the brass-knuckles case on her iPhone to attack Britney Markham at a Newport Beach salon on April 6.

Britney has since asked the court for a restraining order against Jenna. It’s unclear if she also plans to follow up with a civil suit against Jameson — but we’re guessing it’s only a matter of time.