Stories about UFOs are top movie themes but some celebrities also believe in them and by extension, believe in aliens too. But it's not just celebs who believe in UFOs and extraterrestrials. According to historical accounts, there are also a number of famous people from history who believe that we are not alone. From Elvis to former U.S. Presidents, famous believers of the UFO phenomenon come from diverse backgrounds.

Richard Nixon
The U.S. President from 1969 to 1974 said in a press conference, "I'm not at liberty to discuss the government's knowledge of extraterrestrial UFO's at this time. I am still personally being briefed on the subject." A close friend of Nixon Jackie Gleason was reportedly taken to Homestead Air Force Base where Nixon showed him the bodies of extraterrestrials. His former wife Beverly McKittrick said that Gleason described the aliens as small beings that are "only about two feet tall with bald heads and disproportionately large ears."

Gleason reportedly did not want the story to come out and never talked to McKittrick since she revealed the story to the press.

Jimmy Carter
Jimmy Carter, the President of the United States from 1976 to 1980 said, "I don't laugh at people any more when they say they've seen UFOs. I've seen one myself." During his campaign, he promised that he will make all UFO-related documents public.

Ronald Reagan
The US President after Jimmy Carter, actor-turned-politician Reagan believed in UFOs. Telling reporters about a UFO sighting, he said, "I looked out the window and saw this white light. It was zigzagging around. I went up to the pilot and said, 'Have you ever seen anything like that?' He was shocked and he said, 'nope.' And I said to him: 'Let's follow it!' We followed it for several minutes. It was a bright white light. We followed it to Bakersfield, and all of a sudden to our utter amazement it went straight up into the heavens. When I got off the plane I told Nancy all about it."

Mikhail Gorbachev
Gorbachev, the last head of state of the USSR said that UFOs exist and that the phenomenon "must be treated seriously."

Prof. Stephen Hawking
Theoretical physicist Stephen William Hawking is known for his work on gravitational singularities. He also believes in UFOs and extraterrestrials. In an interview, the professor said, "Of course it is possible that UFO's really do contain aliens as many people believe, and the Government is hushing it up." In 2010, the professor warned that making contact with aliens is not advisable because they are likely hostile.

Dr Herman Oberth
The German rocket engineer taken by the US after the Second World War said, "It is my thesis that flying saucers are real and that they are spaceships from another solar system. There is no doubt in my mind that these objects are interplanetary craft of some sort. I and my colleagues are confident that they do not originate in our solar system."

Dr J Allen Hynek
The director of Project Blue Book of the US Air Force Dr J Allen Hynek (left in photo) said, "When the long-awaited solution to the UFO problem comes, I believe that it will prove to be not merely the next small step in the march of science, but a mighty and totally unexpected quantum leap... we had a job to do, whether right or wrong, to keep the public from getting excited."

General Douglas MacArthur
In 1955, Douglas MacArthur said that "the next war will be an interplanetary war." He added that nations of the world will have to join forces someday to fight attacks from "people from other planets."

Gordon Cooper
Gordon Cooper wrote a letter addressed to the United Nations in 1978 asking the organisation to set up a research programme to study UFOs. It was in 1951 when the astronaut was driving an F-86 over Germany that he spotted saucers. He later went to space on Mercury 9 in the year 1963 and on the Gemini 5 in '65.

Lord Hugh Caswall Treenheere Dowding
Battle of Britain RAF Fighter Command commander Air Chief Marshal and 1st Baron Dowding Hugh Caswall Tremenheere Dowding said, "I am convinced that these objects [UFOs] do exist and that they are not manufactured by any nations on earth."

J Edgar Hoover
The man who established the Federal Bureau of Investigation (FBI) was caught in a strange situation in 1942 when flying saucers allegedly flew over Los Angeles. The disks were fired at, according to reports. In a statement to the press, Hoover said, "We must insist upon full access to disks recovered. For instance, in the LA case the Army grabbed it and would not let us have it for cursory examination."

Walter Cronkite
In the 1950s, Walter Cronkite was invited to a Pacific island with other reporters to observe an Air Force display of their new missile. As it launched, according to Cronkite, a flying object in the shape of a disc hovered in the sky. The UFO later fired a bluish beam towards the missile but it also hit an Air Force security personnel and his dog. The security guard, the dog, and the missile froze in place after the beam hit them, reports say. The reporters, in shock, were told by a colonel that the Air Force has been working on a new technology and wanted to test how people will react when they see it in action. Cronkite and other reporters were told not to report the incident.

Fran Drescher
"The Nanny" star Fran Drescher believes that she and her ex-husband met because of chips that aliens planted in them. Drescher and her former husband also have matching scars located in the same spot.

David Bowie
David Bowie once claimed that he has seen a UFO repair shop. The singer and songwriter wrote a number of songs about alien life forms.

Sigourney Weaver
The actress who played the lead in the movie "Alien" believes other life forms exist. She said, "We are not alone in the universe. I think there's a department in [the US] government which is exclusively dedicated to quashing reports about aliens and that's so unfair."

Elvis Presley
UFOs were reportedly always around The King all his life. According to Presley himself, UFOs were hovering in the sky when he was born. He also claimed that he was visited by aliens when he was 8-years-old and showed him what his future will be like. Many Elvis fans believe that an Unidentified Flying Object was with mourners during his funeral.

Mick Jagger
The Rolling Stones frontman believes in aliens. He said he saw a cigar-shaped spaceship in the year 1968 during a Glastonbury camping trip. Another experience of the singer was in California in 1969 during one of his band's concerts.

Dan Aykryod
The "Ghostbusters" star is a member of a nonprofit organisation called the Mutual UFO Network. The nonprofit follows extraterrestrial activity. In the year 2010, Aykryod appeared on "Larry King Live" and said some aliens do not come in peace.

Tom Cruise
Scientologist Tom Cruise believes in aliens and even went as far as constructing an $11 million bunker to protect himself and his family from an alien invasion. In the doctrine of the Church of Scientology, alien life forms live inside humans.
Pulitzer Prize winner Lawrence Wright details in his new book "Going Clear: Scientology, Hollywood & the Prison Belief" that the "Top Gun" actor "seeks to save people from aliens living inside people." In an interview, Cruise said, "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, we just don't know."

John Lennon
While in his New York City penthouse in 1974, he and then girlfriend May Pang allegedly saw an Unidentified Flying Object. Since they were on the roof, they saw it at a close range. The Beatles member was reportedly excited about the sighting and called the cops and several local papers. The authorities confirmed that they also received similar phone calls from other people. Before his death, Lennon allegedly received an egg-shaped object from alien visitors.