Bullock and her son were seen sporting spooky make-up as she holds hands with Louis. She wore a lace dress with a skeleton corset during the outing, reported Aceshowbiz.
Louis even had bat wings to complete his looks. The 3-year-old boy, however, did not wear the wings.
In a recent interview with Vogue, Bullock said that Louis was her priority.
"I think this business can take the child out of kids so quickly. I don't want him to have pressures brought on by what I do. I will quit. I will leave. If I see whatever I'm doing affecting him negatively, I will pack up and move to Alaska," she said.
"If all of a sudden someone said, 'You have five more kids,' I'd be totally OK with it. I'm having such an amazing time. Whatever comes our way, we handle as a family. It's not just me anymore," she added.