AA flops top set. how do i play this w/o the lead?

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I've been pretty active as far as pfr's and c-bets are concerned but haven't played a 3-bet pot yet.
haven't seen villian get out of line at all.

PokerStars No-Limit Hold'em, $0.50 BB (4 handed) pokerhand.org hand converter

Hero ($56.85)
SB ($24.55)
BB ($51.15)
UTG ($26.85)

Preflop: Hero is Button with A[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/spade.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to $2</font>, <font color="#666666">1 fold</font>, <font color="#CC3333">BB raises to $4.5</font>, Hero calls $2.50.

Flop: ($9.25) 9[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets $6.5</font>, Hero ???