The Mayan Calendar dictates that Dec. 21, 2012 is doomsday, the start of a world apocalyptic event. While most people look at it as another prophecy that will not happen, some people believed that the prediction is true, including some famous celebrities.

There are few Hollywood celebrities that said that what the Mayans claimed is true. According to the prophecy, the Mayan calendar ends on December 21, 2012, so many people believe that date to be the end of days.

According to CNN, the calendar had a 5,126-year cycle, so many wonder why the ancient civilization, known for their advanced grasp on astronomy, chose this date. The Mayan calendar is divided into bak'tuns, 144,000-day cycles. According to NBC News, the last cycle on the calendar is fast approaching.

Other people believe that instead of destruction, humanity will enter a new era both physically and mentally. Skeptics believe nothing will happen at all and refer to the craze as an Internet hoax.

One of the popular celebrities that believed with the forthcoming apocalypse is the two-time Academy Award-winning American-Australian actor, director, producer and screenwriter Mel Gibson. He once made comments that suggested that the Mayan civilization and the United States have a lot in common. Gibson said, "The precursors to a civilization that's going under are the same, time and time again." He also said, "What's human sacrifice if not sending guys off to Iraq for no reason?"

Us Magazine reported that Gibson also said jokingly, "I just wanna draw the parallels. I don't wanna be a doomsayer, but the Mayan calendar ends in 2012. So have fun, boys and girls!"

Famous rapper Lil' Wayne is also reported believing the doomsday prediction. He told Blender magazine, "The world is about to end in 2012 'cause the Mayans made calendars, and they stop at 2012. I got encyclopedias on the bus.

"The world is about to end as we know it. You can see it already. A planet doesn't exist - there's no more Pluto. Planes are flying into buildings - and not just the Twin Towers. Mosquitos bite you and you die. And a black man and a woman are running for president."

During a recent symposium in Yucatan, Mexico, three Mayan culture experts readily debunked rumors of an impending apocalypse.

The conference, called "Mayan Cosmic Gathering," included archeologist Tomas Gallareta, astronomer Arcadio Poveda Ricalde and professor Marte Trejo, who delivered speeches clarifying misconceptions about the Mayan calendar.

According to a statement released for the event, the three Mayan experts concurred that the Mayan calendar does not predict the end of the Earth.

National Aeronautics and Space Administration (NASA) and the United States government also debunked the apocalyptic prediction.

See the slideshow for some of the celebrities that believe that the world will come to an end on December 21, 2012. 

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According to reports by MSNBC, Mel Gibson made statements that were indirectly referring to the condition of the United States during a promotional tour of his new film called “Apocalypto” which is about the fall of the Mayan empire.

Dwayne Michael Carter, Jr. better known for his stage name Lil Wayne, is an American rapper. Lil Wayne is convinced the world will soon end after reading about Mayan prophecies on his tour bus, and he is sure recent events in world history prove the Mayans were right - and Armageddon will happen in 2012.

The popular punk rock group made their beliefs are made clear in their song "Doomsday Clock".

The actor said once, “I think that there is a real sense in our culture that we are heading towards some kind of apocalypse – maybe it is part of the Christian concept of the apocalypse but I am not saying that is an exclusively Christian concept. Maybe that is one of the things that make people resonate with these apocalyptic movies.”

Joe Rogan is an American comedian and actor best known for his role as Joe Garrelli in NewsRadio and as host of the TV game/reality program Fear Factor. Joe makes a number of references to 2012 on his website and even talks about it in his standup comedy shows. It was interesting to discover that the personalized License Plate on his car read "Dec 2012".