Big Brother CBS to premiere thirteenth season of 'Big Brother' on July 7 05/10/2011 CBS has announced Big Brother's thirteenth season will premiere Thursday, July 7 at 9PM ET/PT. Read More RELATED NEWS 'Big Brother' couple Rachel Reilly and Brendon Villegas reveal newborn son's name'Big Brother' couple Rachel Reilly and Brendon Villegas welcome a baby boy!'Big Brother' couple Daniele Donato and Dominic Briones welcome their first child! TAGS: Big Brother Julie Chen