Marc Anthony angrily denied the rumor his marriage with Jennifer Lopez ended because she found out he was having an affair with his HawthoRNe co-star, Jada Pinkett-Smith. "When something like that happens, it's laughable,” Anthony, 42, told ABC's John Quinones on Thursday’s Nightline, over the alleged tryst with Pinkett-Smith, who herself was dogged by rumors of an impending breakup with husband Will Smith last month.