Don't count on Paris Hilton to take a trek on the inaugural flight of Richard Branson's Virgin Galactic space cruiser. Before Paris Hilton boldly goes where no heiress has gone before, she has to overcome her fear of flying -- into space.

"I'm very scared to do it," said she, who fears becoming an airless head. "What if I don't come back? With the whole light-years thing, what if I come back 10,000 years later, and everyone I know is dead? I'll be like, 'Great. Now I have to start all over.'"

Hmmm...Paris Hilton 10,000 years later? How will she explain exactly who (or what) she was?

Meanwhile, Madonna and Apollo 13 star Tom Hanks are among the celebs who are expected to pony up the 200K for a round trip 50,000 feet from earth.

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