Stars 1/2 - AA 3 way vs a lot of action

[JSampras1]

Wondering if this was misplayed somewhere. Please let me know what you think of my line.

MP3 is 36%/2.7%/AF 1, BB is 24%/21%/AF 1.8

When the guy limp/4 bet the flop i wasn't really happy about it. I was thinking there's a good chance i'm against at least 2 pair. When the flush card hit, if it went bet/raise i would have folded.

I can't fold for 1 more small bet. There's a good chance i'm beat, but the pot is so big, and we're in relatively late position, so it's possible someone thought i'm on a steal and is overplaying.

PokerStars 1/2 Hold'em (10 handed) Poker Stars Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: Hero is SB with A[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/heart.gif[/img].
<font color="#666666">5 folds</font>, MP3 calls, <font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises</font>, <font color="#CC3333">BB 3-bets</font>, MP3 calls, <font color="#CC3333">Hero caps</font>, BB calls, MP3 calls.

Flop: (12 SB) 7[img]/images/graemlins/heart.gif[/img], 3[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets</font>, BB calls, <font color="#CC3333">MP3 raises</font>, <font color="#CC3333">Hero 3-bets</font>, BB calls, <font color="#CC3333">MP3 caps</font>, Hero calls, BB calls.

Turn: (12 BB) K[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, <font color="#CC3333">BB bets</font>, MP3 calls, Hero calls.

Now this guy bets out the K, and the other guy just calls. If MP3 raises i fold. I thought the bet out was strange, and could easily be AK or the Ad. I don't really understand MP3's call. Either he was overplaying the j, or he's a donk and is scared to bet his set or 2 pair. Anyway i called for 1 more.

River: (15 BB) Q[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, BB checks, <font color="#CC3333">MP3 bets</font>, Hero calls, BB calls.

Final Pot: 18 BB

Another bad card, but BB's check means I have him beat, and it's 1 bet back to me in this huge pot. I am pretty sure i'm behind, but i'm getting 17-1 so this is an easy call right?

Should i have folded earlier, or is this standard?