The mother of Leighton Meester "threatened to kill" one of the Gossip Girls star's former pals, Breaking Celebrity News has exclusively learned.

EXCLUSIVE COURT DOCUMENTS: Read Restraining Order

Laurel Wiig won a restraining order against Constance Meester, the actress' manager, after an ugly confrontation on January 21 in which she threatened to "hunt down and kill" and "f*ck up" the woman.

A Los Angeles judge ordered Constance, 55, to stay 100 yards away from Wiig.

"She is an addict and had made a threat to kill," Wiig wrote in the court papers, obtained exclusively by Breaking Celebrity News.

Constance gave birth to her daughter while doing time in a Texas prison after being nabbed in a drug ring, as the National Enquirer first revealed.

She was convicted in Georgia as part of an aun