"Big Brother" Season 27 contestants better grab a life vest, because star Rachel Reilly is checking in as the 17th houseguest

Grab a life vest, floaters, because look who just resurfaced back in the Big Brother house.

Rachel Reilly, winner of Big Brother 13, was unveiled as the "mystery houseguest" competing again this summer on season 27.CBS had been teasing a secret player all week and dropping clues on social media as to who it was.

Big Brother host Julie Chen Moonves will weigh in on the latest events inside the house. This week, she reacts to being abducted by the Mastermind, Rachel Reilly’s return as the mystery houseguest, playing for the first Head of Household win,

Big Brother host Julie Chen Moonves had some time to kill during the show’s season 27 premiere on Thursday, July 10. The action-packed opener kicked off on a shocking note with the introduction of a mysterious new character called “The Mastermind,

"That's a world I don't even want to imagine," Chen Moonves responds when asked about a 'Big Brother' future without her