The secret is out on the identities of the three pairs of rivals competing in BIG BROTHER 8. Host Julie Chen announced the secret enemy pairs last night to viewers during the premiere episode.

As part of the twist that will play out during the summer broadcasts, last night six of the 14 Houseguests learned that they will be sharing the house with an enemy, a rival or someone with whom they have unfinished business — in short, someone from their past who they had hoped never to see again or someone with whom there is an extreme amount of tension.

In last nights premiere episode, the enemy dynamic seemed to create an early alliance of 11 versus three, with the three being the group of enemies who entered the BIG BROTHER 8 house earlier in the evening before the 11 entered.

In addition to viewers learning the enemy pairs, the premiere episode revealed the identity of �gAmerica�fs Player,�h Eric Stein. Beginning Sunday, July 8 (8:00-9:00 ET/PT), at the conclusion of every episode, viewers will be asked to vote on an important assignment that Eric Stein, a 27-year-old from New York, must complete. It could be a strategic move or a personal action. Stein must attempt to do what viewers request, including voting out a specific Houseguest. And, he can never tell anyone in the house that he is working on behalf of the viewers. But, Stein needs to be careful �c just like his fellow Houseguests, he can be voted out at any time. If Stein successfully accomplishes these assignments as �gAmerica�fs Player,�h he will be financially rewarded. Viewers will be able to vote on CBS.com or via text messaging on a mobile phone and will choose from multiple choice answers on each question. The prevailing vote must be completed by Stein in order for him to be rewarded.

Each Thursday, the Houseguests compete to become Head of Household. The perks of the position include a luxurious private bedroom and bathroom, along with a plasma screen spy cam to monitor other Houseguests�f activities. However, it also includes the responsibility of having to nominate two fellow Housemates for eviction. On the weeks when there are veto challenges, one of the nominees can be saved from the chopping block if they, or another Housemate, wins the Power of Veto competition and chooses to save one of the nominees, while giving themselves immunity from nomination. If they choose to use the veto power, the Head of Household must immediately choose another nominee.

Last night, the Houseguests competed in a competition called �gMushroom Madness�h to see who would become this season�fs first Head of Household. Kail Harbick, the 37-year-old Business Owner, from McKenzie Bridge, Ore., won the coveted position.

BIG BROTHER 8 is broadcast each week on Sundays (8:00-9:00 PM, ET/PT), Tuesdays (9:00-10:00 PM, ET/PT) and the live eviction show, hosted by Julie Chen, on Thursdays (8:00-9:00 PM live ET/delayed PT).

Following are the three pairs of enemies, and their relationship, who are competing in BIG BROTHER 8:

JOE BARBER II, 23 Ex-Lovers DUSTIN ERIKSTRUP, 22
Chicago Chicago
Single Single
Receptionist Shoe Salesman

DANIELE DONATO, 20 Estranged Father/Daughter DICK DONATO, 44
Huntington Beach, Calif. Los Angeles
Single Single
Waitress Bar Manager

JESSICA HUGHBANKS, 21 Former Best Friends CAROL JOURNEY, 21
Haysville, Kan. Lawrence, Kan.
Single Single
College Student Student

Following are the remaining 8 Houseguests competing in BIG BROTHER 8:

JAMEKA CAMERON, 28 AMBER SIYAVUS, 27
Waldorf, Md. Las Vegas
Single Separated
School Counselor Cocktail Waitress

MIKE DUTZ, 26 NICK STARCEVIC, 25
Three Lakes, Wis. Kimball, Minn.
Single Single
Painting Contractor Former Pro Football Player

KAIL HARBICK, 37 (Female) ERIC STEIN, 27 (�gAmerica�fs Player�h)
McKenzie Bridge, Ore. New York
Married Single
Business Owner Talent Management Assistant

JEN JOHNSON, 23 ZACH SWERDZEWSKI, 30
Beverly Hills, Calif. Burbank, Calif.
Single Single
Nanny Graphic Designer

BIG BROTHER 8 is executive produced by Emmy Award winner Allison Grodner and Rich Meehan, in association with Endemol U.S.A.

For more information on BIG BROTHER 8 and the 14 new Houseguests, log on to www.CBS.com.