Robbie Williams to spend $5m on an alien observatory

British singer Robbie Williams is planning to spend $5m on an alien observatory.

The 34-year-old 'Feel' star has been passing his time visiting the National Optical Astronomy Observatory in Tucson, Arizona, and now he's planning to build his own viewing station - so that he can monitor the skies for extra terrestrial activity whenever he wants.

A source said: "He is leading a bizarre existence at the moment, vanishing into the desert to $5 million. He is hooked on all things from outer space."

Former 'Take That' star Robbie - whose 2006 'Close Encounters World Tour' was alien-themed - recently revealed he was planning to quit his career as a pop star - and turn his alien obsession into a full-time job.

He said: "Seriously, I want to go out and investigate these things. I'm stopping being a pop star and becoming a full-time ufologist."

The singer also claims he has seen at least three UFOs. "I was lying on my sun lounger outside at night. Above me was a square thing that passed over my head slightly and shot off," he said.