2/4 : AA - where did I go wrong?

No real reads on villians as I sat down fairly recently. The cold call on turn really had be worried.

Party Poker 2/4 Hold'em (9 handed) internettexasholdem.com

Preflop: Hero is MP1 with A[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/diamond.gif[/img].
UTG calls, UTG+1 calls, <font color="#CC3333">Hero raises</font>, <font color="#666666">1 fold</font>, MP3 calls, <font color="#666666">1 fold</font>, Button calls $3.50 (All-In), SB calls, <font color="#666666">1 fold</font>, UTG calls, UTG+1 calls.

Flop: (12.75 SB) 5[img]/images/graemlins/diamond.gif[/img], 6[img]/images/graemlins/spade.gif[/img], 2[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(6 players, 1 all-in)</font>
<font color="#CC3333">SB bets</font>, UTG calls, UTG+1 calls, <font color="#CC3333">Hero raises</font>, MP3 calls, SB calls, UTG calls, UTG+1 calls.

Turn: (11.37 BB) 5[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(6 players, 1 all-in)</font>
SB checks, <font color="#CC3333">UTG bets</font>, UTG+1 folds, <font color="#CC3333">Hero raises</font>, MP3 calls, SB folds, UTG calls.

River: (17.37 BB) Q[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(4 players, 1 all-in)</font>
<font color="#CC3333">UTG bets</font>, Hero calls, <font color="#CC3333">MP3 raises</font>, UTG calls, Hero calls.

Final Pot: 23.37 BB