That’s right, Rachel Reilly the comp beast is officially back. The “Big Brother 13” champion is Head of Household this week on “Big Brother 27.” Her victory comes after her ally Ava’s Pearl HoH reign got out a major player on the other side of the house: Zach Cornell.

There's a new houseguest on "Big Brother 27," and they have shaken up the game. Following Thursday's live eviction episode, the houseguests competed in an HOH competition. Here's who holds power this week and which houseguests they nominated. Rachel Reilly is this week's Head of Household.