QQ from MP. LOTS of action

[cs3]

Party Poker No-Limit Hold'em, $ BB (6 max, 6 handed) converter

UTG ($24.05)
Hero ($48.10)
CO ($39.30)
Button ($5.30)
SB ($24.85)
BB ($17.07)

Preflop: Hero is MP with Q[img]/images/graemlins/club.gif[/img], Q[img]/images/graemlins/spade.gif[/img]. SB posts a blind of $0.10.
<font color="#CC3333">UTG raises to $2</font>, <font color="#CC3333">Hero raises to $3.75</font>, CO calls $3.75, <font color="#666666">3 folds</font>, <font color="#CC3333">UTG raises to $8</font>, Hero calls $4.25, CO calls $4.25.

Flop: ($24.35) 8[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>

What now? should this be an easy fold?

How did i play the queens preflop? Did i donk it up by reraising and then just flat calling the 3 bet? I really didnt expect CO to call preflop. I think he called only becasue i did... if i would have folded he probbaly would have too.
no read on UTG, notes on CO say "smart player, does not over play big pairs, checked behind on river with AA on paired board to win nice pot."