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“You’d better rein in Pauley Perrette — or I’ll sue her!”

That was the shocking demand made by mega-star Mark Harmon in a conference call with CBS execs after he was publicly pummelled with abuse charges made by his former NCIS co-star Perrette, sources tell RadarOnline.com.

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“Mark told them he hasn’t hired a lawyer — yet, but is ready to take legal action if she continues to claim he assaulted and intimidated her!” said a source close to the 67-year-old.

Perrette, 50, claimed Harmon “body checked” her and pushed up against her on the set, a source said.

She even publicly slammed her nemesis on Twitter earlier this month, tweeting “I am terrified of Harmon and him attacking me. I have nightmares about it.”