"Real Housewives of New York City" star Ramona Singer has filed for divorce from Mario, her husband of 27 years, People.com said Thursday. The news of their split follows reports stating Ramona caught him cheating on her at their Hamptons home last weekend. Ramona said Wednesday the situation is "a personal and private matter for our family" and asked for "privacy during this difficult time." Season 6 of "The Real Housewives of New York City" is to premiere March 11 on Bravo.