Paris Hilton amped up her security after a stalker showed up at her father's office, pretending to be her fiance and armed with a knife. "I've had a lot of stalker incidents, and I usually can handle them," the socialite says. "But the scariest one was when a guy turned up at my dad's office and said he was my fiance. He forced his way inside and the cops discovered he had a knife on him. That was freaky. Now I have a lot of security all the time so I feel safe. I guess that's one of the things you have to learn to live with, but it's still scary."
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