The 'So Macho' singer had been hotly tipped for the Channel 5 reality show - but Dawn, one of the cast members of ITVBe's Real Housewives of Chesire, is also said to have signed up.
The rivals are said to have fallen out two years ago in a row over a mutual friend.
A source was quoted as saying: "Getting Sinitta and Dawn both in the house is a genius move. There is genuine anger between the two of them."
Now Sinitta has claimed that she changed her mind on CBB because she was 'scared' it would result in a confrontation.
Simon Cowell's bestie told the Daily Star: "I know Dawn is going into the house, but thank God I am not.
"I did ask for 24-hour security as I have been hit once in my life and I did not want to be hit again.
"I just wish Dawn all the best. I won’t be watching as I will be doing other things."
A previous report had suggested it was actually CBB producers that decided to cut Sinitta, because of her 'diva demands' - such as that 24-hour security.
She owned up to the outlandish requests in a chat with OK!, saying: "If I last more than halfway, I want my puppy to visit me.
"I want a swearing ban, because I don't swear and people shouldn't be allowed to swear at me or around me.
"I asked for a bodyguard who would stand with me at all times, especially when I'm asleep. If they provide alcohol, then I want tequila because it's all I drink."
Celebrity Big Brother is back on Channel 5 on Tuesday at 9.00pm.