Robbie Williams wants to start his own mystical religion... dedicated to extra-terrestrials.The heartthrob singer hopes his bizarre alien faith will be as big as celebrity favourite, Scientology, which counts A-list stars like Tom Cruise and John Travolta among its followers.He came up with the plan after reading about the late L. Ron Hubbard, the founder of Scientology - which teaches that aliens created the world.He told BBC Radio 2 presenter Chris Evans: "If L. Ron Hubbard can start a cult, then so can I."I'm not going to start it right now because I'm too busy. But I want to do it. I think the cult will have to wait until next year. But it will be free and universal."The religion would reportedly be aimed at people who share Robbie's long-running fixation with aliens.Last year the singer claimed the world would soon be invaded by little green men.

He said: "I've been dreaming every night about UFO's. I can't wait to go to sleep at night because those dreams have been so brilliant.

"I think they are definitely on their way, seriously. Mark my words. From now until 2012 - watch out kids."

Robbie has also claimed he had premonitions San Francisco was going to be destroyed by an earthquake, but says extra-terrestrials prevented the disaster.