The answer is aliens!
Robbie Williams is house hunting in Australia - so he can go UFO hunting.
The 'Bodies' singer arrived in Sydney this week with girlfriend Ayda Field to promote his new album, 'Reality Killed the Video Star', and will also use the trip as an opportunity to find a property in the Australian Outback.
One of Robbie's team has already been to visit the Holiday Park, in Wycliffe Well, which has more reported UFO sightings than any other place in Australia.
Jessica Biel believes in aliens.
The actress - who voices an extra-terrestrial being in new animated movie 'Planet 51' - doesn't understand why people are not open to the possibility that there are civilisations on other planets.
She said: "I definitely believe in the possibility of intelligent life on other planets.
"There's just so much space out there not to believe in that. For me, the idea with this movie is to be open to change.
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