200nl - KK facing strength pre-flop

[skegvegaspoker]

Party Poker No-Limit Hold'em, $ BB (6 handed) internettexasholdem.com

CO ($187.70)
Button ($236.26)
SB ($213)
BB ($199.75)
Hero ($200)
MP ($96.07)

Preflop: Hero is UTG with K[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/spade.gif[/img]. SB posts a blind of $1.
<font color="#CC3333">Hero raises to $8</font>, MP calls $8, <font color="#666666">1 fold</font>, <font color="#CC3333">Button raises to $18</font>, <font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to $55</font>, MP calls $47, Button calls $236.26 (All-In), Hero...?

BTN is 55/9 and weak-tight.
MP is 58/25.

I hate folding fullstop. I especially hate folding KK. And I REALLY hate folding KK preflop! But, BTN's range is pretty damn small here.