Is the 4th raise always aces??

[paddymcg21]

Pretty self explanatory. . .

You raise with AK and get re raised, you then re raise and your opponent shoves. AK goes in the muck. . easy. Same goes for QQ/JJ.

The problem is when you have KK. I just find it tough to lay it down when all signs point to aces. I mean why 4 bet pre flop unless you have aces?? So basically is the 4 bet always aces or should we be calling with KK most of the time?