... Houseguest Jessica Graf to compete on this season of BIG BROTHER. CBS' summer reality hit begins with a two-night premiere event on Wednesday, June... Houseguest Jessica Graf to compete on this season of BIG BROTHER. CBS' summer reality hit begins with a two-night premiere event on Wednesday, June... Houseguest Jessica Graf to compete on this season of BIG BROTHER. CBS' summer reality hit begins with a two-night premiere event on Wednesday, June... Houseguest Jessica Graf to compete on this season of BIG BROTHER. CBS' summer reality hit begins with a two-night premiere event on Wednesday, June... Jessica Graf is the latest evictee on Big Brother. BIG BROTHER airs on Sundays and Wednesdays and on Thursdays on the CBS