Saturday night, Cowell was about to watch himself on television (of course) in his west London mansion when he heard a loud noise. The X Factor star rushed upstairs to investigate and found Leanne Zaloumis standing in his bathroom with a brick.
The woman, thought to be an over-zealous fan, had come in through a window. She was detained by Cowell's security team until police arrived.
The 29-year-old was charged with aggravated burglary and is set to appear in court today.
"It was very frightening for Simon, who told me it was like something from a horror movie," said Cowell's rep, Max Clifford.