Jennifer Lopez has moved on after her split from Marc Anthony, getting cozy with backup dancer Casper Smart. However, Radar Online reports that Anthony is concerned about the safety of the ex-couple's twins Max and Emme since Smart has been arrested for drag racing and even has warrants out for his arrest because of it. Anthony is adamant about not wanting his tots being driven or chauffeured by Smart.

Since La Lopez is a Fiat spokeswoman, she could easily take control of the vehicular transport of the kids, and with a gratis, safe car from the company she endorses, right? Whatever the case, Anthony is hopping mad about his ex's new boyfriend having a dangerous past. Drama!

Radar also reports that Anthony "went ballistic when he found out about Casper's criminal record." The source goes on to say, "He explicitly told Jen that Casper wasn't allowed to drive their children anywhere. Marc hates the fact that Casper is spending time with Max and Emme. Marc is extremely jealous, and doesn't think Jen is using good judgment when it comes to Casper."

The source also insisted that Anthony is not playing games and is not looking for a reason to oppose his ex-wife's new love. "This wasn't a threat that Marc gave Jen. He will go straight to family court if he needs to get a judge involved to make sure Casper doesn't get behind the wheel with his kids in the car," the source revealed.

Lopez is having serious transportation issues as of late. We reported yesterday that a private jet service she used has been called out by a former employee for unsafe operating procedures. Perhaps Anthony should worry if J. Lo charters a flight with their twins, as well.