Robbie Williams has appeared on an alien specific podcast to discuss his fear of aliens contacting him.
The fear has grown so large that he was forced to install round the clock "24 hour security" at his home.
"The reason why I started having 24-hour security was not for my own safety, it was just because I was scared of what was happening around me when I was alone." he told the podcast host on Alien Nation.
"I was always scared to talk to them because that would make it real and if it was just in my head then it would just be in my head. If I said it out loud then I would be more scared than I already was."
The singer added he might have a "mental illness", but admitted he was only saying that to appease any "sceptics".
Maybe this is a mental illness. I don't think so, but I have to put that out there for the ¬sceptics.