Pocket As facing bet on ugly flop

[theblitz]

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

Hero ($50.85)
SB ($265.90)
BB ($24.90)
UTG ($45.20)
MP ($67.85)
CO ($7)

Preflop: Hero is Button with A[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/club.gif[/img]. SB posts a blind of $0.10.
UTG calls $0.25, <font color="#CC3333">MP raises to $0.5</font>, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to $2</font>, <font color="#666666">2 folds</font>, UTG calls $1.75, MP calls $1.50.

Flop: ($6.35) 3[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/diamond.gif[/img], Q[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
UTG checks, <font color="#CC3333">MP bets $4</font>, Hero ?

2 hands earlier I had KK and I called down a bluff by UTG.
Unlikely MP has KK so I find it hard to see a hand I am ahead of.