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Former “Real Housewives of New York City” star Julianne “Jules” Wainstein was arrested Sunday for allegedly punching her estranged husband, Michael Wainstein, in the face, Page Six can exclusively reveal.

Boca Raton, Florida, police arrested Jules, 39, for battery and booked her in Palm Beach County’s main detention center around 3:50 p.m. Sunday, according to court documents obtained by Page Six.

A source tells Page Six that things got heated during the former couple’s usual custody exchange in a parking lot, with Jules allegedly licking Michael’s car window before heading around to the back of the vehicle and damaging it with a baseball bat.

Jules then allegedly punched Michael in the face, the source told us.

We’re told the Wainsteins’ two children were in the car at the time.

Jules appeared in court on Monday, as did Michael. Her arraignment is scheduled for March 16.

Jules’ attorney didn’t immediately return Page Six’s request for comment.

Michael’s attorney, Morghan Richardson, told Page Six that Michael is “exploring all of his legal options at this time.”

“This is a serious situation reflecting Ms. Wainstein’s increasingly reckless behavior that unfortunately took place in front of the kids,” Richardson said. “The children were released to Michael’s custody yesterday and he is most concerned about protecting them.”

Page Six also has confirmed that Michael obtained a protective order against Jules.

Jules and Michael have been involved in a nasty divorce battle. In 2017, Michael faced jail time of his own after failing to pay $135,000 in child support to his ex. He had claimed she had blown through a five-figure support payment in two days instead of saving it for their children.

The former reality star told Bravo in October that she was temporarily living in Boca Raton with her parents as her contentious divorce continued to play out in court.

“Until my divorce is over, I’m temporarily living in Boca at my parents’, which actually happened to be a nice thing because unfortunately my father just recently passed away,” she said in an interview on “Life After Bravo.” “So we got to spend the last year with him, which we wouldn’t have spent as much time if we were living in New York. So we’ll be there until things settle, and then hopefully we’ll move back soon.”

Jules starred on Season 8 of Bravo’s “RHONY,” which aired in 2016.

Additional reporting by Chelsea Hirsch