Convicted kid-killer Lori Vallow Daybell got into a testy exchange while cross-examining a woman who went on a date with her fourth husband the night before his murder.

Vallow Daybell — who is representing herself in the Arizona trial for her estranged husband Charles Vallow’s 2019 killing — appeared peeved that her late hubby went on a date with witness Nancy Jo Hancock while they were still technically married.

“Do you go on dates with married men?” Vallow Daybell asked during cross-examination Wednesday, before being shut down by the judge. “So you did go on a date with a married man?” she asked again, reframing the question.

Hancock — who met Vallow on a Christian dating app in July 2019 as his marriage to Vallow Daybell was breaking down — insisted they did nothing more than text for a few days before meeting up for dinner, and that she wouldn’t have seen him if he wasn’t separating.

“I did go on a date with Charles,” Hancock told Vallow Daybell, according to NBC News. “I knew his divorce was not final.”

“His divorce was not started,” Vallow Daybell quipped.

“Okay,” Hancock said, evidently at a loss for words.

The trial is the 51-year-old cult-obsessed mother’s second over a vicious scheme to run off with a lover and pile of insurance money that left two of her children — 7-year-old JJ and 16-year-old Tylee — murdered.

She was already convicted of her kids’ murders and is facing life sentences in Idaho — but is now accused of conspiring to murder Vallow, who she allegedly enlisted her brother, Alex Cox, to shoot dead. Cox died later in 2019.

That was just the first of numerous moments during the cross-examination where the 51-year-old appeared angry and jealous that her slain husband had been to dinner with Hancock that July.

Later, Vallow Daybell pressed for details on what was spoken about during the date, and Hancock recalled that Vallow talked about his kids, a bit about his marriage, and how he mentioned feeling “concerns for his safety” that drove him to make his sister the beneficiary of a $1 million life insurance policy

“So you spent your whole date getting to know each other, talking about me?” Vallow Daybell asked.

“Don’t flatter yourself. No, we did not spend the whole time talking about you,” Hancock responded.

Later, Daybell asked Hancock if men often talked about “supposed ex-wives” on dates

“It’s actually very common,” Hancock replied.

“Really?” Vallow Daybell shot back. “Interesting.”

The judge then sustained an objection against Vallow Daybell, telling her to “please stop” adding comments about Hancock’s answers.

Vallow had filed for divorce shortly before the murderous plot allegedly unfolded, with the alarmed husband growing concerned over her beliefs about past lives on other planets, zombies, Armageddon and the second coming of Jesus.

He claimed that his wife had threatened to murder him and included a request for mental health treatment in his divorce.

The day after Vallow’s date with Hancock, he was shot dead while he was picking up Tylee from Vallow Daybell’s house. There, he encountered Cox, who is believed to have shot him dead after an altercation. Cox claimed self-defense and was never charged in the killing before he died.

Vallow Daybell could face another life sentence if convicted. She also faces another Arizona trial in May for an alleged plot to kill her niece’s ex-husband.

The husband Vallow Daybell allegedly hatched the murderous plot with — Chad Daybell, who she married only two weeks after his wife Tammy was also murdered — was sentenced to death in June for the deaths of her kids and Tammy.

Daybell has been allowed remove her prison garb in court as she mounts her defense — but is still required to wear a shock-belt that police can use to subdue her if she gets out of line.