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Who Is Kasey Dexter? New Details About The Mistress Who Stole Christie Brinkley *And* Ramona Singer's Husbands

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kasey dexter
Love, Heartbreak

She was Mario Singer's mistress!

Anyone who watches the Real Housewives of New York know Ramona Singer — and definitely remember when she divorced her husband of 22 years, Mario Singer, in 2014. Why? Because Mario was cheating with his mistress, Kasey Dexter.

The two started dating in 2013 and lived together in West Palm Beach ... up until things fell apart. Mario caught her cheating with him after setting up camera on their property. Hmmm, a cheater being cheated on. Fascinating.


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But who is Kasey Dexter? Is she more than just a homewrecker? Well, don’t get your hopes up.

1. She has a degree from LSU.

Photo: Facebook

Dexter got her Bachelor’s Degree in Kinesiology, but decided to pursue a career in modeling and acting. She eventually moved to New York City where she found a job as a personal trainer at La Palestra.

2. She had an affair with her La Palestra boss.

According to Reality Tea, the relationship ended after she was accused of being obsessed with the manager, George Peters, and checked herself into a mental health facility. Even juicier? She later filed a lawsuit against the gym and Peters.

3. She has a history of being the other woman.

Photo: Facebook

Oh yeah, did we mention that Peters was married when the affair started? Talk about patterns.


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According to her complaint against him, Peters “would ask [Dexter] to have sex with him on various pieces of equipment and training tables at La Palestra. Even though the sexual relationship was consensual, [Dexter] still hesitated and/or protested having sex on the equipment” though Peters “would convince [her] to have sex on the equipment because he was the manager and could make [Dexter] a great trainer.”

4. Other than being a mistress, she’s also a cheater.

Though she was with Mario for almost four years, he had set up hidden cameras in their home, eventually catching her having sex with another man. Well, what would you expect when you’re dating someone who is 28 years younger than you and also your mistres?

Mario confronted her and told her she had 30 days to leave, which led to a massive blowout on their property. The police were called, with Dexter alleging Mario had emotionally abused her and offered her thousands of dollars to move out.

5. She’s currently dating Christie Brinkley’s ex.

Peter Cook, 59, apparently flew Dexter from Florida to the Hamptons for a week-long vacation. Cook and Brinkley divorced in 2008 after — you guessed it — he was caught cheating on her with an 18-year-old! Cook’s most recent ex-wife, Suzanne Shaw, revealed that he has a “pathological” desire for young women. What is it with these old dudes wanting to be with women more than half their age?


RELATED: 11 Signs He's Looking For A Mistress, NOT A Wife


Samantha Maffucci is an associate editor for YourTango. In her free time, you can find her obsessing about cats, wine, and all things Vanderpump Rules.

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