Theory 2: Marc has been insanely jealous ever since he realized that J-Lo was checking out Steven Tyler's "zaniness" on American Idol.
It must be hard watching your wife sit next to one of the biggest players in rock 'n' roll history. It must be even worse when she's swept off her feet by his "zaniness," as she told MTV back in January, every time she sets foot on the set of American Idol. And don't even get us started on that little booty-shakin' routine J-Lo put on during the final week of AI this season that, conveniently, Steven could see but Marc couldn't. No wonder he went out and tried to steal your BFF Pitbull, Jennifer!