Big Brother -- Kalia Booker, from Philadelphia, Pennsylvania, will be one of the new Houseguests competing for the 500,000 prize this summer on Big Brother. Big Brother premieres July 7 (9:00-10:00 PM, ET/PT) on CBS. Photo: Cliff Lipson/CBS. © 2011 CBS Broadcasting Inc., All Rights Reserved PHOTOS ARE EMBARGOED UNTIL THURSDAY, JUNE 30 AT 9:00 AM, ET/6:00 AM, PT.