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Katy Perry has revealed she believes in aliens. Find out which other stars think the truth it out there...
The 'California Gurl' has revealed she believes in aliens. "I believe in a lot of astrology. I believe in aliens. I look up into the stars and I imagine: How self-important are we to think that we are the only life-form?" she tells GQ. "I mean, if my relationship with Obama gets any better, I'm going to ask him that question. It just hasn't been appropriate yet."
'Go Gentle' singer Robbie was so interested in the possibility of alien life forms that he seriously considered giving up music to become a 'full-time Ufologist'. "I was lying on my sun lounger outside at night," he revealed in 2008. "Above me was a square thing that passed over my head silently and shot off."
She famously starred in 'Alien' - but Sigourney Weaver thinks extra-terrestrial life form is more than fiction. "We are not alone in the universe. I think there's a department in our government that is exclusively dedicated to quashing reports about aliens. And that's so unfair," she told German magazine Spielfilm. "It would be nice if we weren't just able to read about it in the tabloids."
'The Day The Earth Stood Still' star Keanu Reeves thinks the truth is out there. "How can it be possible that we are the only beings in the universe? I don't know if or when we will get to meet them, but it's absolutely inconceivable that we won't get to meet them sometime."
The Grammy-winner says she has seen UFOs. "Haven't all of us seen something flying in the sky, and it's at some random time of night that doesn't make sense, and it's not the shape of a plane?," she asked Buzzfeed in October 2013.
"Are you really so arrogant as to believe we are alone in this universe? Millions of stars, and we're supposed to be the only living creatures? No, there are many things out there," said the 'Jack Reacher' star in 2007. "We just don't know."
"Everyone thinks I'm crazy," the 'Teenage Mutant Ninja Turtles' told Ellen DeGeneres on her American TV chat show. "It's all about the theory that these megalithic structures were possibly built by—not necessarily like little green aliens, but maybe future humans that they call ancient astronauts—that did some sort of time travel. Something extraterrestrial was involved."
It may not be surprising that the 'Star Trek' actor is a believer. "In my mind, there is no doubt that the universe teems - teems! - with life in all its forms," he said in 'William Shatner's Weird Or What?'. "But why they would come visit here and not let themselves be known to everybody is beyond my sense.
The 'New Girl' star believes in aliens so much, she even thought her sibling was one! "I grew up believing my sister was from the planet Neptune and had been sent down to Earth to kill me," she told The Daily Mail in September 2009. "I think she'd seen Invasion Of The Body Snatchers and her imagination ran away with her. There's a part of me that still believes it. I have moments when I think, 'Hmm, could that be true?'"
Jaden Smith is a fan. "I like aliens!" he told Wonderland in April 2013. "I talked to President Obama about extraterrestrials. He said he could neither confirm nor deny the existence of aliens, which means they're real. If people think we're the only people that live in this universe, then something is wrong with them."