KK - too weak?

[raze720]

BTN is playing 26/12/0.64 through 34 hands.

Full Tilt No-Limit Hold'em, $1 BB (6 handed) Full Tilt Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

BB ($139)
UTG ($155.50)
MP ($132.10)
Hero ($137.50)
Button ($88.50)
SB ($100.50)

Preflop: Hero is CO with K[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/heart.gif[/img].
<font color="#666666">1 fold</font>, MP calls $1, <font color="#CC3333">Hero raises to $6</font>, Button calls $6, <font color="#666666">2 folds</font>, MP folds.

Flop: ($14.50) Q[img]/images/graemlins/spade.gif[/img], Q[img]/images/graemlins/heart.gif[/img], 9[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $10</font>, Button calls $10.

Turn: ($34.50) 7[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Button bets $24</font>, Hero calls $24.

River: ($82.50) 4[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Button bets $48.50 (All-In)</font>, Hero folds.

Does my weak post-flop play oblige me to call the river vs. this player? His stats (aggression factor especially) swayed me towards the weaker line ... pretty stupid since I only had 34 hands on him.