Alex Rodriguez’s ex upset by Jennifer Lopez’s involvement in child support drama

Jennifer Lopez has inserted herself into the mediation process between Alex Rodriguez and his ex-wife.

J-Lo, known for her pricey baubles and five-figure exotic-skinned Birkins, not only attended a Sept. 13 mediation in Miami between the retired slugger and his ex, but the “Dinero” singer inserted herself into their sensitive child-support negotiations.

J-Lo’s presence blindsided Cynthia, sources said, with the A-lister going so far as to force A-Rod out of the room when Cynthia was present.

The legal proceeding quickly devolved when Lopez insisted that Rodriguez, who earned more than $400 million in his MLB career, should only have to pay $10,000 a month in child support — a pittance compared to the reported $100,000-plus he’d been doling out monthly to support his young daughters Natasha and Ella, sources said.

The mediation was to continue the next day, but was scuttled after the first day’s contentiousness.

“She’s driving the bus,” one source said of 49-year-old Lopez’s influence on the former steroid-using Bronx Bomber.

“All I can tell you, there’s been a shift, and I’m not sure what to attribute it to,” said Cynthia in a rare public interview last week. “Alex has dated some wonderful women since our divorce, many of whom have had positive relationships with our children. Alex and I have worked well trying to create a stable environment for our daughters and there has never been an issue. Until now.”

On Father’s Day, Lopez, who shares twins Emme and Max with ex-hubby, singer Marc Anthony, posted a video of her beau opening his gifts with the caption: “Happy Fathers Day to the most loving daddy to Tashi and Ella!! And thank you my love for being so beautifully loving to Emme and Max … We are all so lucky to have you in our lives.”

While Cynthia’s divorce settlement is confidential, she hasn’t been sitting around waiting for her ex’s money to flow in. In addition to raising her two daughters with A-Rod, Cynthia has purchased, constructed and renovated several Miami properties successfully over the last decade. She has a degree in psychology and volunteers for several women’s groups and sponsors various charitable events.

“That’s not the way I was raised, and I find it deplorable that private information is being spread in the news,” says Cynthia. “Finances are not an issue for my former husband, and they’re not an issue for me. There really is no issue. That’s why this is so unsettling.”

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