Angelina Jolie "Experimented" With Knives With an ex-Boyfriend

Hollywood star Angelina Jolie has revealed she used to "experiment" with knives with a former-boyfriend when she was younger -- and one incident left her scarred.

The actress -- who is currently dating Brad Pitt, with whom she's expecting twins -- says the incident, which caused scarring on her abdomen and thigh, happened when she was 14 and "curious about vampires."

She reveals, "When I was 14, I collected knives. My first boyfriend and I ended up getting into some fighting in bed and being silly. People think that happens every time I go to bed.

"It was actually something he never wanted to do again. It was a mistake and we really hurt ourselves. It was just being young, you know, when you're curious about vampires and that kind of thing. Just experimenting. It was an accident and I ended up in hospital."

The 'Wanted' star, 33, reportedly married first husband, Jonny Lee Miller, wearing a shirt with his name written on it in her own blood.

She and her second husband, Billy Bob Thornton, wore vials of each other's blood around their necks.