U.S. reality competition series \"Big Brother\" has been renewed for a 16th season, CBS announced Thursday. Season 15 is to wrap up with a 90-minute finale Sept. 18. Julie Chen is the show\'s host. Season 16 is to be broadcast next summer. The series sequesters a group of housemates from the outside world and places them under 24-hour surveillance for weeks during which they compete in various challenges.