Celebrities don't wield any power comparable to that of rulers or monarchs. We allow unbounded accumulation of wealth but that's a facet of our political and economic system.
Most social animals imbue their elders with some level of authority but this is easy to explain as an evolutionary habit to make use of lived experience and thus, hopefully, expertise. It's obvious why you'd ask the person with the most experience or the best domain knowledge for their assessment or even to lead you in that domain. It also makes sense to appoint a leader during times of war when the battlefield requires split second decisions that don't allow for consensus seeking.
But human nature is cooperative if nothing else. We resort to exclusion, hierarchy and domination/obedience only under duress, which our current system helpfully maintains perpetually.