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Splash wholesale halloween costumes NewsHe’s the prince of wails.

The Monaco royal battered swimwear manufacturer China in a Manhattan bar brawl earlier this year is suing his alleged attacker, the bar and the alleged assailant’s attorneys for “bad-mouthing” him.

In papers filed in Manhattan Supreme Court, Pierre wholesale swimwear Casiraghi says he suffered “personal injuries” because the nightclub, the Double Seven, had turned a blind eye to Adam Hock’s “visibly intoxicated, violent, abusive . . . vicious habits and propensities.”

Joining Casiraghi in the lawsuit is his princely posse, art dealer Vladimir Roitfeld and banker Diego Marroquin, who also claim they were roughed up by Hock in the late-night melee at the trendy Meatpacking District club on Feb. 18.

According to the suit, the trio had been invited over to Hock’s table in the VIP area by club owner Jeffrey Jah.

Hock “demonstrated overt signs of intoxication,” the suit says, and didn’t care for the company. He “punched, struck and/or attacked” all three, the suit says, before club employees tried to sneak him out “through a back door.”

Hock, a former owner of the now-shuttered Hawaiian Tropic Zone in Times Square, was later charged with misdemeanor assault for attacking the three men and a fourth man, Paris Hilton’s ex Stavros Niarchos. Hock contends he was defending himself.

The suit says Jah “knew or should have known” that Hock was “a person of pugilistic propensity.”

Jah’s lawyer, Terrence Oved, said his client “unequivocally disputes the allegations.”

The pouty prince and his pals are also suing Hock, his lawyer, Joe Tacopina, and his former lawyer, Sal Strazzullo, for defamation.

Hock, the suit says, damaged their “reputations for peacefulness and good manners” by telling The Post earlier this year that he was “victimized by several drunk entitled guys who felt they deserved the prime table” and who “expected to be treated like the royalty they are.”

The three were ticked at Tacopina for describing them as “self-entitled punks who don’t have anything better to do than to spend their parents’ money . . . They think Mom and Dad will dig them out of whatever trouble they get into.”

The legal eagle didn’t back down yesterday.

“Every statement we’ve made, we’ll back up,” Tacopina said. “I’m looking forward to litigating this. Immensely.”