CBS has announced that the producers of "Big Brother 4" have made a casting change to the previously announced group of houseguests, increasing the "X Factor" from four couples to five couples. Previously announced houseguest Brandon Showalter has been replaced with a fifth ex who will be revealed along with the remaining four HouseGuests in the premiere episode on Tuesday, July 8 (8:00-9:00 PM, ET/PT) on the CBS Television Network.

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