Party .5/1: AKs in MP3 (Correct to call down?)

[zram21]

I was playing .5/1 during the day for the first time in a long time so the tables were a bit tighter than what they usually are. Stil loose, but just tighter than normal. MP1 in this hand is loose-passive preflop, but is aggressive post flop. The button and SB have both only been at the table a few hands and are unknown.

Party Poker 0.5/1 Hold'em (10 handed) converter

Preflop: Hero is MP3 with K[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/heart.gif[/img]. CO posts a blind of $0.5.
UTG calls, <font color="#666666">2 folds</font>, MP1 calls, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises</font>, <font color="#666666">1 fold</font>, Button calls, SB calls, <font color="#666666">1 fold</font>, UTG calls, MP1 calls.

Flop: (12 SB) T[img]/images/graemlins/diamond.gif[/img], 3[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(5 players)</font>
SB checks, UTG checks, MP1 checks, <font color="#CC3333">Hero bets</font>, Button calls, SB calls, UTG folds, <font color="#CC3333">MP1 raises</font>, Hero calls, Button calls, SB calls.

Turn: (10 BB) 4[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, <font color="#CC3333">MP1 bets</font>, Hero calls, Button calls, SB folds.

River: (13 BB) 3[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">MP1 bets</font>, Hero calls, Button calls.

Final Pot: 16 BB

Is calling this down correct against a loose, but aggressive player post flop?