It looks as though Ramona Singer isn't taking any chances when it comes to her husband, Mario Singer, and his alleged mistress, Kasey Dexter. The Real Housewives of New York star apparently kept her husband real close to her and by her side during an event in the Hamptons over the weekend.

Ramona Singer's Husband Still Cheating On Her With His Mistress?     

According to the Daily Mail, the 57-year-old reality star attended the 3rd Annual St. Barth Hamptons Gala in Southampton, N.Y. on Sunday. Many eyewitnesses say Singer and her husband put up a united front, despite the rumor that he may still be cheating on her with his alleged mistress.

Meanwhile, it looks as though Dexter herself tried to confront Singer while she was dining with friends this past weekend.

Why Did Ramona Singer Send Kasey Dexter A Threatening Letter?     

According to a Page Six story from last Saturday, Dexter showed up at the restaurant where Singer happened to be dining with friends. The website says Dexter has asked to leave and while she was being escorted by a manager, "she came up to the stars and tried to make a beeline to the dining room."

The manager then grabbed Dexter, who shouted, "You just don't want me to tell her I'm still f---ing her husband."

Alfredo 100 manager John Djomblic confirmed that the scene did actually occur, although both Singer and Dexter have refused to make any comments.

Just last month, there were reports that Mario Singer was still cheating on his reality television star wife as he might still be seeing Dexter on the side.

"Mario is definitely still in touch with Kasey - and they even spent time together a couple of weeks ago. So I wouldn't be too confident about his level of commitment," a source recently told Radar Online.