While “Real Housewife” Countess LuAnn de Lesseps graced a number of public Hamptons events over the weekend, her new husband, Tom D’Agostino Jr., was spotted getting close to another woman.

Amid divorce buzz, de Lesseps — who Page Six recently revealed is having problems with her hubby of just eight months — hit up fellow Housewife Jill Zarin’s Luxury Luncheon and charity shopping event Super Saturday in the Hamptons, but her husband wasn’t at her side, and was later seen flirting with someone else, sources tell Page Six.

A spy says later Saturday night, “An attractive blond woman at [famed dive bar] Murf’s in Sag Harbor was seen getting a text from “D’Agostino … one of her friends blurted out, ‘That’s her married ex-boyfriend Tom, who’s still in love with her.’ ”

Our witness adds that just 45 minutes later, Tom “showed up at the bar, solo, wearing his wedding ring, but likely loving his surroundings since the dive bar wouldn’t be a spot his usual circle of friends would find him in.”

We’re told he waited until the mystery blond’s friends left before “putting his hand over hers. He went in to get even closer to her, but she pushed him away noting that people could still be watching. It looked like he was up to no good.”

Tom’s rep insisted this account was “total rubbish,” and while he did go to the Sag Harbor bar Saturday, “he was with a group of friends, and there was no clandestine meeting with a blond woman. He wants to make his marriage work.”

Page Six reported earlier this month that the couple has been struggling amid rumors of his infidelity before they took their vows, plus problems over her public life as a TV star.

Luann told Page Six, “We are together in Sag and are happy. He went to meet mutual friends for drinks. There is no story there.”

D’Agostino said Sunday, “Luann and I had a great weekend together in the Hamptons. We went to a dinner party together and I went out to meet our mutual friends for drinks after. Luann knew where I was and who I was with. There is no story here.”