He said she falsely accused him after he confronted her about her Oxycontin addiction.Porn legend Jenna Jameson is a serious 'Mean Girl' ...

"Cooked my first Shabbat dinner tonight," she wrote.

The lead of such porn classics as “I Dream of Jenna” and “Hell on Hells,” Jameson also made headlines in 2010 when she claimed Ortiz pushed her into a bathtub and injured her arm during an argument at their home.

Ortiz was arrested but quickly released and adamantly denied abusing Jameson.

Amber says the harassment's been going on ever since she started dating ex-UFC star Tito ... Jenna now has to stay 100 yards away from Amber -- and stop all forms of harassment.

Her baby will not arrive in time to catch Santa this year.