The split between Jennifer Lopez and Marc Anthony is getting nasty since he found out about her relationship with Casper Smart, according to a report from UsWeekly. Some insiders are saying it could affect custody arrangements already agreed upon. One source said Anthony "hit the roof" when he saw photos of Lopez, Smart and the kids.

The source is also quoted in the article as saying "He wants to make Jennifer suffer because she's having fun with someone else." We can only hope for the kids' sake it doesn't get as nasty as the insiders are saying.