Big Brother (season 4)

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 also broadcast on E4 in the United Kingdom, beginning near the end of that country's fourth series.

The winner of this season was Reid Henson.

This season was preceded by season three and followed by season five.

HouseGuests
Thirteen HouseGuest were cast for this season of Big Brother. As part of this season's twist, five of the original eight HouseGuests were shocked to find that an ex would be playing the game with them, as part of the "Ex-Factor" twist. The exes were Courtney and Foster, Kristopher and Sadie, Lisa and Reid, Miguel and Tabitha, and Ty and Violet.

Voting history
Ten HouseGuests entered the house with an ex-partner, with whom he or she broke up prior to the show. These exes are indicated by matching colors in the chart. Beyond the personal effects of their histories and relationships, there was no direct effect on the mechanics of the game; exes were free to work with or against each other as they saw fit.