But he insists he kept his trademark cool during the entire experience, which eventually resulted in his landlord having to call in an exorcist.

“I had one (a ghost) in my house once - and this is an absolutely true story," he tells Britain's The Sun.

“I was living in Kingston Hill in South West London and my mum and dad were staying with me next door. I heard this banging on the door and I went to my mum and dad’s room and said, ‘You were banging on my door.’ They said, ‘What do you mean? It wasn’t us.’"

Simon wasn't sure what to do so he went back to his bedroom before the ghost got busy banging again.

"It was literally like someone banging on the door," he adds. "There was a dog in the house freaking out and then my parents left to go home."

The ghost wasn't finished with Cowell, though.

"The following day I heard this crashing noise and all the stuff had fallen in the kitchen. I later found out that the land where my house was on was part of a bigger house" - a house which had also been haunted. His landlord then had to take evasive action which took care of the otherworldly presence once and for all.

"It got so bad they had to call in an exorcist.”

The famously unfazed media mogul insists he was never scared.

"There was definitely a presence but I wasn’t afraid," he smiles. "Before I had an encounter, I thought it might be like how you see in the movies with a sheet moving across the room, but I thought it was someone trying to make contact.”