Paris Hilton makes sure new friends and potential lovers know how to keep a secret by telling them a fake fact and then waiting to see if it leaks out to the media.
The socialite has become very guarded and careful when it comes to making new friends - because she has been betrayed so many times by people who can't keep their mouths shut.
And now she has a system to make sure she can trust the people she hangs out with.
Appearing on U.S. TV show Lopez Tonight! on Tuesday (21Jun11), The World According to Paris star explained, "I'll basically tell them a fake rumour and then see if it's printed in the tabloids the next week."