The pregnancy of the 32-year-old actress was first revealed by InStyle editor-in-chief Ariel Foxman in October when he congratulated her over Twitter, however the couple has yet to confirm the happy news themselves.
Justin's 'N Sync pal Joey Fatone also let the beans spill recently when he told In Touch, "He told me a while ago and I kept my mouth shut. But now I can talk about it," he said. "Jessica is awesome and Justin is a kid at heart. [They'll have] fun."
Jessica and Justin have been married since 2012. This will be the first child for both.