The X Factor USA judge was recently said to have hired a healer to remove negative entities from his home in Hollywood.
Cowell appeared to confirm the reports on Twitter, stating that the healer did a "great job".
"I have to say the house healer did a great job," he tweeted. "I did it because if you believe something can make you feel happier then try it.
"I wasn't trying to get rid of bad things but I believe your home should be peaceful.
"'And two people came round today and said the house felt different. So you never know."
He added: "And a new show we have been working on for a while got picked up this week. Spoooookeeeee."
Simon Cowell was recently rumoured to be dating Carmen Electra, after they were spotted kissing in a restaurant.
He has also been tipped to make a permanent return to the UK X Factor.