Big Brother' cast change: Christie Valdiserri tests positive for

Big Brother warns viewers to always expect the unexpected, but no one probably expected a cast change already -- as Christie Valdiserri has been dropped from the cast and replaced due to a positive COVID-19 test result.

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Big Brother 23's Christie Valdiserri leaves CBS competition after testing positive for COVID-19

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Who's In The 'Big Brother' Season 23 Cast? Meet The Contestants