The New York Knicks celebrated their NBA Championship victory with a slam-dunk soirée at Lower East Side members-only hotspot Flyfish Club.

Jalen Brunson, Mikal Bridges, OG Anunoby, Josh Hart, Karl-Anthony Towns and their teammates rocked up to the private venue at around 10:30 p.m. Sunday night, the club’s co-founder David Rodolitz exclusively told Page Six.

“All the players were in tremendous spirits [and] high energy,” Rodolitz said. “There was a lot of chemistry with these guys — like, the natural chemistry and the way they move on the court, it continued at Flyfish Club. It was collaborative. There was so much love and fun and joy.”

While the club is typically closed on Sundays, the VCR Group CEO and his co-founders — Gary Vaynerchuk and chefs Josh Capon and Conor Hanlon — opened the private establishment exclusively for the players.

We’re told the guests of honor — including Landry Shamet, Miles McBride, Tyler Kolek, Mohamed Diawara, Kevin McCullar Jr., Trey Jemison III, Dillon Jones, Ariel Hukporti and Jordan Clarkson — enjoyed endless amounts of caviar, passed bites, delicious Knicks-themed desserts and an entire omakase room.

They also sipped on bottles of Armand de Brignac Champagne, Don Julio 1942 tequila and specialty cocktails made with Lobos 1707 tequila.

Jalen’s wife, Dr. Alison Marks Brunson, and Towns’ fiancée, Jordyn Woods, also attended the party, as did New York Yankees star Jazz Chisholm Jr.

For the entertainment, A Boogie Wit da Hoodie put on an energetic performance for the champions.

“People were dancing and singing,” Rodolitz said, adding that “everyone was hugging” one another. “It was just beautiful.”

We’re told the soirée kicked off in the upstairs restaurant before partiers made their way to the lower-level cocktail lounge and the festivities raged on until around 3 a.m.

“While we’ve hosted countless memorable nights, this one felt different,” Rodolitz said.

“This wasn’t just another event or appearance,” he noted. “This was the first night back in New York after a historic championship run, surrounded by the people who matter most to them.”

The Knicks defeated the San Antonio Spurs 94-90 in Game 5 of the NBA Finals at Frost Bank Center in Texas Saturday night. They jetted back to the Big Apple after a champagne celebration in the locker room before continuing the festivities on their home turf.

The victory marked the first NBA championship title for the Knicks in 53 years.

“It’s everything I dreamed of,” Brunson said after the nailbiter game, adding, “This is why I came to New York.”