Real Housewives of New York star Ramona Singer has been experiencing marital trouble with her husband of over 20 years, Mario Singer, and although she is trying to keep up appearances – her husband was photographed with his alleged mistress, Kacey Dexter, earlier this week.

On the reunion show on Tuesday night, host Andy Cohen asked the reality star questions about her marriage to no avail. “Everyone in my family is doing well. Mario and I are together ... Let's go to someone else. Thanks, Andy,” she said before getting angry, Daily News reports.

"I want this closed down! Stop it, Andy. I don't want to talk about it,” she added.

But it seems there’s trouble in paradise again, as In Touch Weekly obtained photos of Mario out with Dexter on Aug. 2 at Anassa Taverna in New York City.

“She threw Mario out in late July because she discovered he was back with his mistress,” a source said or Ramona.

In late July, Mario was also seen holding hands with Dexter in the Hamptons' Montauk.

image via Kristin Callahan/ACE/INFphoto.com