very hard KK (pre)flop decision

[urbanati]

Doyles room 0.25-0.50 NL 6 handed.
Hero has 78$ villain covers.
Villain is quite loose, aggressive and is willing to bluff.
Villain raises to 1.50 UTG,
everyone folds,
hero is on the BB with KK and raises to 4.50,
villain raises to 28,
hero thinks and is afraid of AA but calls.
Flop comes TJQ rainbow.
Hero is to act...