[Miley] was snapped spending Halloween day with Arnold Schwarzenegger's 21-year-old son, Patrick, who is a student at USC and a model. And, a source tells ET that the rumors they are dating are absolutely true!

Patrick's famous family is not too thrilled with the news. In fact, our source claims Patrick's family has tried to talk him out of dating Miley, preferring one of his exes and fearing Miley might get him hooked on the Hollywood scene.