Paris Hilton has increased her security after a stalker pretending to be her fiance arrived at her father's office armed with a knife.

The singer/actress decided her personal safety had to take precedence after the deluded man, who police arrested, showed up at her dad Rick Hilton's place of business.

She says, 'I've had a lot of stalker incidents, and I usually can handle them.

'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.'

Hmmmm.........