Big Brother, Julie Chen Moonves and Rachel Reilly
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Big Brother season 27 premiered on July 10 with a 90-minute episode. During the premiere, season 13 winner Rachel Reilly was unmasked as the "mystery Houseguest" who would be joining the contestants in Hotel Mystère. In July 2025, Chen Moonves told Entertainment Weekly that "people should be afraid of [Reilly] and of getting in her crosshairs."
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Us Weekly on MSN'Big Brother' Host Julie Chen Moonves Reveals if She's Going to RetireChen Moonves has been hosting Big Brother on CBS since season 1 aired in 2000. Similarly, Probst, 63, has been hosting Survivor since 2000, while Keoghan started hosting The Amazing Race on the network in 2001.