Who is the Big Brother 19 winner? Those Big Brother spoilers will highlight Wednesday evening (September 20) when the season finale of the summer 2017 season airs on CBS. It’s going to be a busy night for viewers, as producers have a lot to get through during the two-hour event. Toward the end of the season finale, the nine members of the BB19 jury will cast their ballots. Then, host Julie Chen will announce whether it is Paul Abrahamian, Christmas Abbott, or Josh Martinez who has become the Big Brother 19 winner.