Rachel Reilly could become the first two-time winner of CBS's Big Brother, and certain people in the house should be worried for their games.

If Big Brother fans know anything, it's that no one comes between Rachel Reilly and her man, Brendon Villegas. The two met as houseguests on Big Brother 12, immediately connecting over their mutual passion for science,

T hursday's season premiere of Big Brother 27 ended with the shocking return of, as a fellow houseguest proclaimed, one of the show's "Mt. Rushmore" stars: Rachel Reilly, who returned to the game 14 years after winning Big Brother 13 in 2011.