Could be considered to be a concept or perhaps an illness or condition.
It is important to distinguish between someone who is just famous and someone who is a celebrity however, the two are not mutually exclusive. Someone who is famous is merely well-known whereas a celebrity is someone who engages in celebrity behaviour, for example, appearing in “Celebrity” magazines such as OK and Hello in pictures designed to show how fabulously wealthy/good looking they are; appearing in magazines under such articles titles as “How I lost 50 pounds in 4 days!” or “How I overcame some kind of heartbreak!” like any evolved, thinking person gives a shit. For Christ’s sake, how insecure are these people.
Celebrities are confused. They have lost sight of what important in life i.e. spiritual fulfilment and well being of all people, and now cling to their own celebrity status as though it is that which keeps them alive. It has become the sickly sweet teat from which they must be constantly nourished in order to feel like a functioning member of society whereas in fact they are a plague on the society they crave acceptance from or a feeling of belonging to. We would all be better off if they just went away.
Theirs is indeed a cruel fate: their status suggests to them importance and acceptance yet they are simply one of too many soulless ciphers existing in some kind of sub-human circle of self-perpetuating self-promotion.