Rachel Reilly is Big Brother 27 mystery houseguest
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Here's everything you need to know to tune in to Big Brother when season 27 premieres this week! The new season of Big Brother premieres on Thursday, July 10 at 8 p.m. ET. This week's episode will be a special 90-minute premiere,
Big Brother follows a group of people living together in a house outfitted with more than 100 cameras and 100 microphones, recording their every move 24 hours a day. Each week, someone will be voted out of the house, with the last remaining Houseguest receiving the grand prize of $750,000.