Big Brother 25 "is the 25th season of the American reality show" Big Brother ". The season premiered on August 2, 2023 on CBS and Global Television in Canada, and the 25th anniversary special program aired on July 26. The program is hosted by Julie Chen Moonves and tells the story of a group of contestants (known as HouseGuests) who live together in a house and are constantly being filmed without any communication with the outside world. They are competing for a $750000 prize.