Correct river play or did I get wet?

[Buccaneer]

Most interested in what you think of my river play. Feel free, as always, to chop my legs out from under me on the rest of my play!

Reads: Everyone is "partying" except me an one other guy. The others are playing with 63o etc. One villan is 93% over 20 hands and the other is 100% over 15 hands.

I knew that I was ahead until the river but when the heart hit my heart dropped to my feet. I knew that I might be beat and bet it to represent the A [img]/images/graemlins/heart.gif[/img] just in case he had the King or less (he did, and had been betting K7 and was playing a pair of 7's when that last heart hit). Was this correct or should I have just folded?

Party Poker 0.50/1 Hold'em (9 handed) converter

Preflop: Hero is BB with K[img]/images/graemlins/club.gif[/img], J[img]/images/graemlins/diamond.gif[/img].
UTG calls, <font color="#666666">1 fold</font>, <font color="#CC3333">MP1 raises</font>, <font color="#666666">5 folds</font>, Hero calls, <font color="#CC3333">UTG 3-bets</font>, MP1 calls, Hero calls.

Flop: (9.50 SB) 2[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets</font>, UTG calls, MP1 calls.

Turn: (6.25 BB) 4[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets</font>, UTG calls, MP1 calls.

River: (9.25 BB) 3[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets</font>, UTG folds, <font color="#CC3333">MP1 raises</font>, Hero calls.

Final Pot: 13.25 BB