Leonardo DiCaprio Almost Lost 'Titanic,' James Cameron Says He Was a Diva
Source: Original publisher
Leonardo DiCaprio almost dropped the ball on arguably one of his biggest roles ... according to "Titanic" director James Cameron, who says he almost showed the actor the door when he came to an audition with some serious 'tude. James spilled it all Tuesday ... saying he asked Leo to come during the audition process to do a chemistry test with Kate Winslet -- who had already landed the part of Rose. In a GQ…