1. TINY TEES: "Jacob [Taylor Lautner] was supposed to have grown taller and really filled out, so we tailored all of the T-shirts he wore to make it seem like he was busting out of them," says Monaghan. For added effect, Lautner wore lifts in his shoes to exaggerate the height difference between Jacob and Bella.
2. TRAINING REGIMEN: "I hit the gym, got myself a personal trainer and started eating a lot," Lautner told us about becoming the bigger, buffer Jacob. "I had to be eating a minimum of 4,000 calories a day, so my trainer was always bringing me snacks." He also did strength-training exercises in his downtime on set.Read MoreLess