They are very common in pop culture (for example in E.T), but there have been records of these beings since the ancient Egyptians. Take a look at this one:
|Notice that the alien is on the figure's lap on the right.|
As Greys are common in pop culture it's not surprising that many people have faked sightings. In fact I can't really find any genuine sightings - if you know any sightings please post a link to the sighting in the comments!
Here is a hoaxed sighting:
|A hoaxed sighting of a Grey on a night vision camera|
What do you think about Alien Greys? Please tell me in the comments!