Chance Meeting: Estranged Husband's Mistress Took Fan Pic With 'RHONY' Star Ramona Singer

In a bizarre twist, Real Housewives of New York star Ramona Singer had taken a photo with the sexy young exercise instructor who her estranged husband Mario was suspected of cheating on her with, RadarOnline.com has learned.

Kasey Dexter, insiders tell STAR, was at a Palm Beach, Fla. restaurant in late 2012 when she noticed the fit reality star in her midst.

Kasey "asked to take a picture with her,” the source said, neither knowing the chance encounter would repeat itself under significantly more stressful circumstances a year later when Ramona, 57, caught Mario fooling around with the 32-year-old hardbody at their Hamptons home, leading to an incident that saw police being called and later, divorce papers being drawn up.

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"Ramona may not recall that first meeting -- and if she does, she probably wants to forget it!” the source told STAR.

As we previously reported, Kasey and Mario are no longer on talking terms, with an insider telling the magazine that after the suspected "affair blew up in public, he blindsided Kasey by cutting off all communication with her.”