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Big Brother's Janelle and Rachel Troll Fans Over Mystery Houseguest Twist

LOS ANGELES COUNTY, CALIFORNIA, JUL 9 – The surprise 17th houseguest arrival aims to boost viewer engagement with reactions split, as speculation centers on former contestant Rachel Reilly, CBS confirmed.

  • Big Brother Season 27 premiered on Thursday, July 10, 2025, on CBS with 16 new houseguests plus a mysterious 17th player at Hotel Mystère.
  • CBS built anticipation by sharing clues about the mystery houseguest, sparking fan speculation and surprise before the premiere episode aired.
  • Rachel Reilly, the Season 13 winner, joined as a regular contestant but is not the 17th mystery houseguest, who remains unknown and has an accomplice within the cast.
  • Julie Chen Moonves revealed that when she learned the identity of the mystery houseguest, she had to prepare herself for something truly surprising, while Reilly expressed his intention to guide the newcomers on how to navigate Big Brother.
  • The season’s premiere featured unexpected twists including a masked visitor and secret accomplice, creating strong polarized reactions among houseguests and viewers alike.
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Big Brother Network broke the news in on Wednesday, July 9, 2025.
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