Article continues below advertisementJoe Keery, Finn Wolfhard, Millie Bobby Brown and their costars are all busy preparing for their next professional endeavors after Stranger Things.Article continues below advertisementBrown, 19, balances her burgeoning film career with motherhood, raising her newborn daughter on a sprawling Georgia farm. Meanwhile, Sadie Sink, 21, and Gaten Matarazzo, 21, have solidified their reputations as rising stars on Broadway.