Seagram liquor heiress Clare Bronfman stared daggers at prosecutors when she appeared in Brooklyn federal court over her role in sex-slave cult Nxivm Tuesday — seething so much that her own lawyer had to tell her to chill out.

“Stop looking,” attorney Mark Geragos instructed Bronfman as two female prosecutors strolled in.

The wealthy scion typically appears expressionless in court but was unusually lively Tuesday — until the government lawyers walked in and she suddenly tensed up. It wasn’t clear why she was so perturbed.

Bronfman — who came to court in a gray sweater, navy blue pants and an Apple watch around her left wrist — was there for a “Curcio hearing” on any possible conflicts of interest with her lawyers.

She has been using her fortune to bankroll lawyers for Nxivm leader Keith Raniere, his sidekick “Smallville” actress Allison Mack, and two other members facing charges including sex trafficking, identity fraud and money laundering.

But Bronfman — a longtime Nxivm adherent who is herself facing charges including conspiracy to commit identity theft and racketeering conspiracy — confirmed that once the money set aside in a trust for their legal bills runs out, her co-defendants will have to pay their own way.

She didn’t say how much was left in the trust, but Judge Nicholas Garaufis revealed at a January hearing that only 25 percent of the original amount was still there.

Garaufis also grilled Bronfman on potential conflicts based on the fact that Geragos’ daughter, Teny Geragos, is representing Raniere, but she insisted she wanted to stick with him.

Bronfman added that she found her lawyer online.

“Like online dating?” Garaufis quipped, cracking up the courtroom.

Tuesday’s hearing was the last of seven Curcio hearings for all of the defendants in the Nxivm case, and the judge ended the day by patting himself on the back for making it through.

“That’s a record for one case,” he said.

Raniere is accused of heading a secret master-slave group within Nxivm — with Mack as his right-hand woman — where female members were branded with his initials, kept on starvation diets and and forced to have sex with him.

Bronfman, Raniere, Mack and their fellow co-defendants are due back in court on April 4.