Bethenny Frankel's ex is now making ugly accusations against her in a bid to win sole custody of their daughter.

Jason Hoppy has allegedly accused her of using him as a sperm bank, a source told RadarOnline.

“During a recent argument, Jason accused Bethenny of using him as a sperm donor in order to have Bryn. Jason was pushed over the edge because Bethenny is going forward with her plans to win sole custody of Bryn," the source revealed.

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The pair was in a New York City courtroom last Friday when a judge overseeing their painful divorce was told they’d been unable to reach a deal.

"In what world does Bethenny live in where she thinks Jason would just walk away from Bryn? It’s clear to Jason that Bethenny once she had their child, she got what she wanted from the relationship and she walked away," the source added.

Frankel and Hoppy married in 2010 while Frankel was pregnant with their daughter Bryn. Their wedding, and planning leading up to it, was aired on the Bravo spin-off series Bethenny Getting Married.

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The former Real Housewives of New York star filed for divorce in January 2013. Hoppy is currently seeking child support and primary custody of their daughter. 

Frankel spoke about her divorce earlier this year, calling her marriage a "mistake."

"Because of Bryn, I can never say, 'I wish this had never happened,'" she explained. "I have a beautiful child who I love so much, who is a part of both of us. In my marriage, I made a mistake. It is what it is. I made the wrong choice. But I do have my daughter, who is so beautiful and amazing in every way."

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Frankel told October's Redbook, "I don't know that I would get remarried. It's too soon to think about it."

She adds, "But I'd listen to my gut. All through reality television, being honest, saying what's on my mind-that's my gut."