Although they appear to be amicably divorcing, "American Idol" judge Jennifer Lopez and estranged husband Marc Anthony may now be heading into an ugly split, reports UsWeekly.
Anthony is allegedly upset over photos of Lopez and her new squeeze, 24-year-old backup dancer Casper Smart, bonding in Hawaii with Max and Emme, Lopez's 3-year-old twins with Anthony.
Marc "hit the roof," one source told Us, adding, "It caused a huge blowup, which could spur the singer to go back on his word concerning the custody agreement he already settled with Jennifer, giving her primary custody."
The source continued, "He wants to make Jennifer suffer because she's having fun with someone new, and he knows this will hurt her on the deepest level."
UPDATE: Marc Anthony's rep released a statement to "Extra" saying, "These allegations are false. Marc thinks the world of his kids and would do anything for them. There is no change in the custody proceedings and is looking to have joint custody. Marc last saw Max and Emme two weeks ago and is traveling to Los Angeles to spend the holidays with all of his children."