Jill Zarin was noticeably absent from last night's The Real Housewives of New York City: 100th Episode Watch What Happens Live Special, but why?

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According to a new report, the former reality star, who appeared on the series' first four seasons, didn't attend the event due to a dispute with Real Housewives creator Andy Cohen.

“When Andy Cohen reached out to Zarin, he was insistent that she participate in the special, due to his enthusiastic belief that she was the original creative force behind the NYC franchise,” All About The Tea reported on Monday. “Jill agreed to appear on the special, but allegedly attached a condition to the deal.”

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“Jill wanted Cohen to read a prepared statement during the show, officially acknowledging Zarin as the creator of the New York City franchise," the site continued. "Jill is thought to have been the driving force behind the initial casting, providing the common denominator between the initial NYC ‘housewives.’"

However, explained the source, "When she asked him to publicly acknowledge his praise, he turned her down flat. It appears that Andy expected to privately schmooze Jill, and his strategy unexpectedly backfired."

During last night's special, Bethenny Frankel made waves, when she accused Zarin of plotting to take her down on The Real Housewives of New York City, by making America hate her.

To see Frankel's complete conversation about Zarin, check out the clip of The Real Housewives of New York City: 100th Episode Watch What Happens Live Special below.

Tags: The Real Housewives of New York City: 100th Episode Watch What Happens Live Special The Real Housewives of New York City jill zarin Bravo Reality TV andy cohen