TROUBLED actor Tom Sizemore lashes out on tonight’s “Dateline” – storming out of an interview.

Sizemore gets enraged when asked if his tears in court, when he was recently sentenced to 17 months in jail for parole violations, were all an act.

“I’m not acting right now. I said f**k the press. I’m done,” he says, storming off and returning a few minutes later to apologize.