Source: Bang Showbiz NewsSimon Cowell has spent £100,000 turning his home into a "fortress".The music mogul has splashed out the huge sum improving security on his London house after a fan was able to break in and hide in his wardrobe earlier this year.A source told The Sun newspaper: "Simon's a perfectionist about everything and his security renovations were so extensive he's had to put in for planning permission to get them done."He basically wants to transform his London home into a fortress."Simon previously admitted he had to hide from Leanne Zaloumis - who was reportedly found in the bathroom with half a brick above her head and her hands drenched in blood - when she broke in during March.Â He said: "I ended up hiding in one of my wardrobe closets until the police found her. That was a little spooky."After hearing a "loud bang" when the intruder crashed through the window when he was watching television in his home, Simon alerted his staff, who in turn called the cops and sent a squad of armed officers to the property.Zaloumis was then found hiding on a shelf seven feet off the ground in a walk-in wardrobe.The intruder appeared in court in August to be sentenced for the break-in.She was handed a 12-month community order with a mental health requirement.She has also been ordered to stay away from Simon under a restraining order, while she must also wear an electronic tag and adhere to a strict curfew.