A-Rod and J.Lo party with Marc Anthony in Dominican Republic

For such a famously divisive character in baseball, Alex Rodriguez is surprisingly popular with one very specific demographic: ex-husbands.

A-Rod — who memorably partied with Google guru Sergey Brin while dating Brin’s ex-wife, Anne Wojcicki — was hanging out with current squeeze Jennifer Lopez and her ex Marc Anthony over the weekend.

Rumors were swirling that Lopez had rekindled her relationship with Anthony — whom she divorced in 2014 — after they performed together on Saturday night at Casa de Campo in the Dominican Republic.

But then A-Rod, J.Lo and Anthony were spotted having a ball together on the dance floor at an afterparty later in the evening.

Lopez and her slugger-turned-sportscaster boyfriend brought their kids from their previous marriages along to the Dominican Republic for Easter weekend.

The hot new couple, who have been dating for a little more than two months, even put together an egg hunt for their kids.

E! reported, “Their kids have also really bonded and become good friends. A-Rod’s older daughter, Natasha, is like a big sister to J.Lo’s twins [9-year-olds Max and Emme].”

A-Rod recently said about Lopez on “The View,” “It’s obvious [that] we’ve been having a great time. She’s an amazing, amazing girl, one of the smartest human beings I’ve ever met, and also an incredible mother.”

Lopez put on a show at the Altos de Chavón Amphitheater at the $10,000-a-night Casa de Campo resort owned by sugar magnate José “Pepe” Fanjul.

Anthony — with whom Lopez is recording a Spanish-language album — was a guest performer, along with Cuban duo Gente de Zona.

Last year, Page Six reported that A-Rod and his then-girlfriend, genetic-testing entrepreneur Wojcicki, arrived at the Met Gala in the same car as her ex-husband Brin and his girlfriend Nicole Shanahan.

A source said at the time that “they all hung out, then they left together. They are all good friends. It’s a modern relationship.”