Carole Radziwill Feuds With 'RHONY' Costar Sai De Silva Over Epstein Files

Carole Radziwill got into it with Sai De Silva while filming the upcoming season of "The Real Housewives of New York" ... and it's all because Sai brought up Carole's name being included in the Jeffrey Epstein files ... TMZ has learned.

Sources connected to production tell TMZ ... Sai made it a point to bring up Carole's name being in the infamous Epstein Files and her past ties to Epstein associate Ghislaine Maxwell.

Carole addressed her ties to Ghislaine in an interview with The New York Times back in March, saying ... "Imagine knowing someone… and then they turn out to be, like, a monster."

Our sources tell us Sai and Carole beefed throughout the season … after Sai decided to grill Carole about the Epstein Files … telling people she felt the need to speak up because she has children. 

Ghislaine is also the photographer who snapped Carole's author photo for her 2005 memoir. 

We're told the season has wrapped, but the cast is still filming confessionals. 

Our sources say 'RHONY' producers were delighted with Carole after deciding to bring her back to the show for season 16. Carole previously starred on the show from seasons 5 to 10.

We're told Carole is featured in every episode despite being a friend of the cast. The producers felt Carole really delivered during production this season.

In fact, we're told Carole was asked to be a full-time cast member but declined ... because she doesn't want the obligations.