Big Brother' is off and running in season 27 on CBS, with double-digit percent growth in total viewers from the year-ago season opener.

Big Brother 27,' hosted by Julie Chen Moonves, premieres on Thursday,. See which houseguests are in power as HoH, who is nominated and who has been evicted so far

Rachel Reilly is back in the Big Brother house, and fans are either cheering or ready to change the channel. The Season 13 champ made a surprise entrance on the July 10 premiere of Big Brother 27 as the long-rumored “mystery houseguest,” after CBS teased her return with a week of cryptic clues.

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

Rachel Reilly and Brendon Villegas met on 'Big Brother 12' and built a lasting marriage after winning fans with their showmance

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

Big Brother season 27 is taking place with a brand new house theme called Hotel Mystere, and it will have mystery challenges for the houseguests left and right.

"So there's going to be a strong reaction in both directions for this mystery Houseguest."Ahead of season 27, here are the 12 best Big Brother seasons to watch, all of which are available to stream on Paramount+.

Big Brother stars are about to race around the world as CBS reveals the next season of The Amazing Race will feature former houseguests. The season 38 cast has yet to be officially announced, but long-time host Phil Keoghan sat down with BB host Julie Chen Moonves to talk about the big crossover.