Simon Cowell was left shocked and frightened after finding a woman armed with a brick in his house on Saturday night.
The music mogul likened the incident to a "horror movie" after discovering the stranger in his bathroom.
Simon was relaxing at home after watching his Britain's Got Talent show take on BBC rivals The Voice, and was set to view his own appearance on Jonathan Ross when he heard noises from his house.
His spokesperson, Max Clifford, says: "There was a loud bang and Simon rushed upstairs to find out what was going on. It came from the bathroom so he went in - and there was a woman standing there holding a brick. She had smashed her way in through the window and it was unclear how long she had been there or what she was doing. It was a very frightening experience for Simon, who told me it was like something from a horror movie. He was just very lucky that all she had was a brick. She could have had a knife, a gun or any other weapon."
Leanne Zaloumis was apprehended by members of Simon's security team, and is currently being held in custody by police, while The X Factor mogul is now beefing up security at his lavish London home, reports The Sun.
It's the latest security scare that has left him shaken - in 2008 he discovered a tracking device under his car and a listening bug in the Britain's Got Talent studio around the same time.
CAUGHT ON CAMERA
Suggested For You
Get top stories and blog posts emailed to me each day. Newsletters may offer personalized content or advertisements. Learn more