So it's not all that surprising that the show's casting process has itself been a bit sensational. Over the last couple of months, it has been rumored that a wide variety of somewhat recognizable personalities may participate. The most recent tally includes "A Shot at Love" reality TV star Tila Tequila; "Party of Five" actor Jeremy London; London's wife, Melissa; Lauren Conrad's ex-boyfriend and former "Hills" star Jason Wahler; Playboy playmate Shauna Sand and oil heir Jason "Gummi Bear" Davis.
A number of these participants have continually confirmed or denied their involvement with the upcoming season of the show, but VH1 has remained mum.
In June, Tequila announced on her blog that she was checking into "Rehab" due to an addiction to prescription painkillers. But in an e-mail sent to The Times on Tuesday, she said she "was having anxiety attacks at the last minute and decided to back out."
She added that the decision not to appear on the program had to do with the show's contract, which "says that [VH1 has] a right to mis-represent you."
"I feel toying with that is not something ok," she wrote.
Meanwhile, Radar Online reported last week that London and his wife would appear on the show. The actor made headlines in June after claiming that three men held him hostage on a hours-long joyride during which he was forced to smoke drugs.
The actor has had an "outside relationship" with Dr. Drew Pinsky -- the show's host -- in the past, which might lead him to sign on, Friesen said.
"The thing with Jeremy is, having grown up in the spotlight, he's a very private person and he successfully dealt with his issues privately. I think making that public is always a consideration," Friesen said of London's concern about participating. "I think that's always a challenge with reality TV, is really getting a sense of what you're signing up for. Something like ["Celebrity Rehab"], you don't really have control over the experience."
A representative for Wahler did not immediately respond to a request for comment, and a representative for Sand said she was not allowed to confirm any news because her client "wants to get paid for that."
A spokesperson for VH1 said the network was not allowed to comment on the cast until show participants actually move into the rehab facility in Pasadena, which has yet to occur. (A production date for the show has yet to be determined.)