AK tptk, gross board

[Profish2285]

No real reads on villain, he just seems to be playing a standard game, not getting out of line. I have been raising a decent amount at the table but am playing a tag game. What do people think of my line and what is your river action?

Full Tilt Poker, $0.10/$0.25 NL Hold'em Cash Game, 6 Players
LegoPoker Hand History Converter

Hero (MP): $41.65
CO: $25.25
BTN: $26.90
SB: $19.30
BB: $31.55
UTG: $43.50

Pre-Flop: A[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/club.gif[/img] dealt to Hero (MP)
UTG folds, <font color="red">Hero raises to $0.85</font>, CO folds, BTN calls $0.85, 2 folds

Flop: ($2.05) 9[img]/images/graemlins/heart.gif[/img] 2[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/diamond.gif[/img] (2 Players)
<font color="red">Hero bets $1.30</font>, BTN calls $1.30

Turn: ($4.65) Q[img]/images/graemlins/club.gif[/img] (2 Players)
<font color="red">Hero bets $3.25</font>, BTN calls $3.25

River: ($11.15) 6[img]/images/graemlins/diamond.gif[/img] (2 Players)
<font color="red">Hero bets $7</font>, <font color="red">BTN raises to $21.50 and is All-In</font>