Ramona Singer and Mario Singer Ramona Singer and Mario Singer

Another Real Housewives marriage bites the dust.

Longtime New York City cast member Ramona Singer has separated from her husband, Mario, after 27 years together, Us Weekly reports.

The magazine alleges that both Ramona, 56, and Mario, 60, have started dating other people.

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News of their separation comes after months of rumors regarding Mario's alleged infidelity. The New York Post reported back in October that Mario had cheated on Ramona with a young socialite who later became pregnant. At the time, Ramona denied the claims. However, the paper reported on Monday that the two got into a heated argument at their Hamptons house and that police were called to the scene.

Ramona and Mario, who renewed their vows on-air in 2010, have one daughter together, Avery.

The new season of The Real Housewives of New York City premieres on March 11 at 9/8c on Bravo.