Julia Roberts means business. The Oscar winner, 57, deeply got into her character while filming the 2009 romantic crime comedy “Duplicity,” according to her co-star, Carrie Preston. “I’m on set doing a very intense scene where Julia Roberts is staring at me wanting me to die because I had slept with her boyfriend,” Preston, 58, recalled on Jesse Tyler Ferguson’s “Dinner’s On Me” podcast last week. “I have to do that cry on cue thing,” Preston added, “which, as you know, is a lot of pressure,