I think I would want Rachel and Brendon Who were on Big Brother US 2 seasons along with The Amazing Race. They also made many appearances on The Bold & The Beautiful along with many wedding shows. Rachel also modelled before Reality TV so I think she would be considered "famous" enough for C5 CBB
Skip to 3:00 to see what to expect on CBB if they were on :P
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CBBUS1: Metta/Omarosa/James/Ariadna
CBBUS2: Tom, Jonathan, Tamar, Lolo, Natalie