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Did Ramona Singer push Jill Zarin out of The Real Housewives of New York City?

Days after Bravo confirmed reports that Zarin, 47, would not be returning for a fifth season, a source told the new issue of Us Weekly (out now) that the pinot grigio-swilling Singer "wanted Jill out and her friends in."

(Alex McCord, 37, Kelly Bensimon, 43, and Cindy Barshop, 47, were also axed from the hit reality series.)

According to the source, Singer "came to Bravo with a few pals she thought would make good additions. Bravo decided to go with the new girls and not Jill, so Ramona basically ran her off the show."

Singer insists she doesn't wield that much power, telling Us: "We can recommend people to come to the show, but it's not my decision."

Though Zarin was part of the original cast, she probably won't be missed by her former costars. "Jill caused a lot of problems," another insider tells Us. "Her castmates were upset with her, since she'd tweet all these negative things. Karma's a bitch."