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Leighton Meester, whose film The Roomate took the number one spot at the box office in its opening weekend, threw herself into work on the set of her CW show Gossip Girl this week as news that her troubled mother, Constance Meester, was hit with a restraining order for making death threats.

Court documents reveal that Leighton's mom threatened to "hunt down and kill" a former friend and her son on January 21st.

The pal slapped Constance with a temporary restraining order and claimed that Constance "is a drug addict and made a threat to kill us." A judge has ordered Meester to stay 100 feet away from the mother and son.

It's unclear what prompted the outburst, but Constance and the woman in question both have children who attend the same school.

Constance Meester has a history of trouble with the law. In 1985 she was convicted of drug trafficking and spent 10 years behind bars, which is where Leighton was born. Leighton was raised by her grandparents until Constance's release in 1995.

So far, Leighton has had no comment on her mother's latest legal trouble.

And for those Gossip Girl fans, you might want to click below to see which hottie Blair Waldorf is reuniting with on the show!