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The Evil Bitches Win :D Big Brother 4 is the fourth season of the reality television series Big Brother. The format of the program remained largely unchanged from previous seasons: a group of contestants, referred to as HouseGuests, are enclosed in the Big Brother House under the surveillance of cameras and microphones. Each week, the HouseGuests vote to evict one of their own until two Houseguests remain on finale night. The winner will be decided by the last seven evicted HouseGuests, collectively known as the Big Brother Jury. Julie Chen returned to host this season. The winner of the series won a $500,000 grand prize, while the runner-up won $50,000. This season was promoted as the "Ex-Factor".