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Newest “Real Housewives of New York City” cast member Tinsley Mortimer is struggling to ingratiate herself with her newfound New York friends upon her return from exile in Palm Beach, Fla.

Last month, Page Six reported that Mortimer, the top New York society swan, desperately wants to return to her throne as the town’s No. 1 socialite and hoped that her role on Bravo’s “Real Housewives” would help catapult her back to the top.

It seems that things aren’t off to a great start.

We’re told that the Tins has raised the ire of her fellow “Housewives” by failing to live up their lofty standards of proper etiquette.

In particular, the erstwhile queen of high society has offended the group by accepting longtime cast member Sonja Morgan’s hospitality — Mortimer has been staying with Morgan while filming the show — without coughing up a gift.

“If you’re a socialite — never mind a ‘socialite,’ if you’re a human — if you’re a guest at someone’s home, you buy them a bottle of wine, or at least a card,” said a source familiar with the brouhaha.

Or as co-star and former countess LuAnn De Lesseps (now LuAnn D’Agostino after her recent wedding) so memorably noted in her 2010 single of the same name, “Money can’t buy you class.”

We’re told that Ramona Singer has boldly taken the matter in hand and confronted Mortimer — who was once married to Topper Mortimer and was arrested for trespassing in Palm Beach last year during a dispute with her ex-boyfriend Nico Fanjul — about the faux pas.

Meanwhile, we’re told that her presence on the show has yet to bring the new blush of energy to the action as had been hoped by its producers.

Another source tells us that Mortimer continues to linger on-camera over her ill-fated romance with Fanjul, which has failed to set the screen alight. Page Six reported that her storyline would involve her search for love in New York, which has so far been fruitless. But Mortimer’s rep sniffed, “There’s no truth to these rumors.”