How is this line with KK?

[Coolidge]

.5/1

This is my 1st orbit of the table so I know nothing.
Hero is UTG+1 with K [img]/images/graemlins/club.gif[/img]K [img]/images/graemlins/diamond.gif[/img]

PRE -
1 folds, Hero raises, 2 folds, MP calls, 1 folds, Button raises, blinds fold, Hero caps, MP and Button both call.

FLOP - 3 players(6.75bb) 8 [img]/images/graemlins/club.gif[/img]4 [img]/images/graemlins/heart.gif[/img]7 [img]/images/graemlins/spade.gif[/img]
Hero bets, MP calls, Button raises, Hero 3 bets, MP calls, Button calls.

TURN - 3 players (10.5bb) A [img]/images/graemlins/club.gif[/img]
Hero bets, MP calls, Button raises, Hero folds...

I didn't know what to do on the turn. I thought I would bet/fold as opposed to check/call, check call.Anyone check/fold?
I need help.