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“The Real Housewives of New York City” just started filming Season 11, and the ladies are already bickering at fancy galas.

Spies saw Ramona Singer and Dorinda Medley arguing over seating arrangements at Denise Rich’s Casa Noble Tequila-sponsored Angel Ball.

“Ramona had invited Dorinda and told her they would be seated at the same table,” a source said.

But “upon arrival, Dorinda was actually seated at a separate table and appeared upset.”

That’s when “Ramona blamed it on the organizers,” but the organizers told Medley it was Singer who “requested a seat change.”

Another source told us Singer “appeared to be in a social-climbing mood. I’m sure it’ll all play out on their show. They had cameras following them.”

Medley couldn’t be reached for comment, but Singer said of the brouhaha: “I was very happy to support the Angel Ball and I thought Dorinda was sitting with me, but somehow . . . They have so many people going. She was upset. I had no control of it and I said I was sorry. We didn’t buy a table. We bought individual tickets. They didn’t put it together. We’re great now — we’re fine!”

Meanwhile, we hear Singer was spotted filming on the Upper East Side with ex-husband Mario on Tuesday. When we asked about that, she hung up.