Daniel Craig believes in aliens.

The 43-year-old actor - who stars in sci-fi movie 'Cowboys & Aliens' with Harrison Ford - is convinced extra-terrestrials life exists in the universe, but is unsure if otherworldly beings have ever visited planet Earth.

He said: "I do believe there's life out there. I'm not sure I believe they've been to Earth but there is life out there."

Daniel, who recently married 'Constant Gardener' actress Rachel Weisz, is not the only Hollywood star to believe in the existence of other life-forms.

'Avatar' actress Michelle Rodriguez has previously confessed to being intrigued by the possibility of life on other planets.

She said: "I believe in the possibility of aliens. We only perceive four per cent of what exists - the other 96 per cent is a mystery to us and to science, so I'm just leaving room for options.

"I can't picture or imagine any aliens being as primal and destructive as humans. Jim Cameron has captured in 'Avatar' and 'The Abyss' what I believe aliens will be like if they exist."

Former Van Halen singer Sammy Hagar has also revealed his belief he was once abducted by extra-terrestrials.

He said: "That's right. It was real. Aliens were plugged into me. It was a download situation. This was long before computers or any kind of wireless. There weren't even wireless telephones."