Well, to keep in context of why Lucy's so big, long story short, Juvia played a prank on her by making Lucy swallow some of her water magic. However, as it turned out, there was a job offer for very large women, especially those with very large bellies. With her new bloating belly, Lucy was sure to get the job. Here's her pose for her job interview. Funny how things work out like that, isn't it?

Lucy Heartfilia is © of Hiro Mashima.