Voyeur alert! CBS' Big Brother — that wildly addictive, Orwellian peep show — will launch its seventh season tonight at 8 pm/ET with Big Brother 7: All-Stars, featuring 12 of the show's most popular houseguests. During the kickoff, host Julie Chen will introduce the 20 semifinalists, then unveil which six were picked by fan votes and which six were chosen by executive producers Allison Grodner and Arnold Shapiro. The winner collects half a million bucks — but not bef
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