The Oscar-winning actress is keen to briefly leave planet Earth to go into another stratosphere, according to Sir Richard Branson.
The entrepreneur - who runs the Virgin Galactic programme, which is planning to launch space tours of Earth in 2014 - told Life & Style magazine: "She wants to go to space. I`m not sure she wants to go on a one-way trip to Mars, but she wants to go to space."
Kate is dating Richard`s nephew Ned Rocknroll, after meeting on the businessman`s Necker Island last August when a fire broke out, and Richard is thrilled things worked out between them.
He said: "Fortunately, the one good thing that came out of the fire was this romance. They`re both very outward going and seem extremely happy together."
Earlier this week, Richard revealed he wants to start a colony on Mars and thinks it is an achievable dream.
He said: "In my lifetime, I`m determined to being a part of starting a population on Mars. I think it is absolutely realistic. It will happen. I think it is absolutely realistic. It will happen."