Viewers Vote For 'Big Brother" Players

This summer, the seventh edition of "Big Brother" is taking a turn toward all-star contestants from the past. Hence, the name, "Big Brother: All-Stars."

And, for the first time in the history of "Big Brother," viewers are getting the opportunity to vote for the former houseguests who will compete this season. Viewers are choosing half the guests who will enter the Big Brother house, narrowing the field from 20 past contestants down to twelve.

Voting continues through June 28.

The all-stars entering the house will be announced during the premiere of "Big Brother: All Stars" on Thursday, July 6.

"Big Brother: All-Stars" will be hosted by The Early Show co-anchor Julie Chen.

To find out more about the 20 contestants campaigning to be All-Stars, and to cast your vote, click here.

"Big Brother: All-Stars" will follow the relationships and conflicts of players who live together in a house outfitted with dozens of cameras and microphones recording their every move, 24 hours a day. One by one, the houseguests will vote each other out of the house.

After three months, the last remaining houseguest will receive the grand prize of $500,000.

While living together in a confined space won't be anything new to the houseguests, choosing between any pre-existing relationships and building new alliances could prove a challenge.