The 38-year-old reality star said that he is so certain of alien existence that he contacted fellow UFO enthusiast Robbie to discuss his views.
He told the Daily Star, 'I have seen UFOs - seriously, I'm not joking.
'I'm so intrigued by the idea of life on other planets. I feel really strongly about what I've seen.
'I've been having email conversations with Robbie Williams. We send each other pictures of our findings and chat about aliens and the possibilities. It sounds really geeky doesn't it?
'I don't get to see him much, but we both love chatting about UFOs and emailing pictures of puzzling looking lights.'
And he even took a trip to America's Area 51 near Las Vegas, a site which is claimed to be a UFO hotspot.
'It was amazing. What we saw was freaky whether you believe it or not. It was the most eerie thing ever,' he said. 'I 100 per cent believe aliens exist.'