NL10 KK 3-bet pot. Villain donks, shove?

[Gelin1]

UTG seems decent, 22/18/2 over 160 hands. How do you continue?

Titan Poker 0.05/0.10, hand converted by the iPoker Converter at Talking-Poker

saw flop | <font color="#C00000">saw showdown</font>

Button ($10.00)
SB ($10.00)
BB ($6.02)
UTG <font color="#C00000">UTG ($12.33)</font>
UTG+1 ($21.84)
CO <font color="#C00000">Hero ($10.39)</font>

Preflop: Hero is in the CO with K [img]/images/graemlins/heart.gif[/img] K [img]/images/graemlins/diamond.gif[/img]
UTG raises to 0.40, 1 fold, Hero raises to 1.20, 3 folds, UTG calls 0.80.

Flop (2.55) 8 [img]/images/graemlins/heart.gif[/img] 5 [img]/images/graemlins/spade.gif[/img] 2 [img]/images/graemlins/diamond.gif[/img]
UTG bets 1.90, Hero...