AK - Thoughts on play

[Backstabr]

Party Poker No-Limit Hold'em, $ Hero (9 handed) converter

CO ($54.25)
Button ($37.95)
SB ($23.75)
Hero ($50)
UTG ($50)
UTG+1 ($81.97)
MP1 ($65.95)
MP2 ($50)
MP3 ($49.5)

Preflop: Hero is BB with K[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/diamond.gif[/img]. SB posts a blind of $0.25. UTG posts a blind of $0.5.
UTG (poster) checks, <font color="#666666">5 folds</font>, Button calls $0.50, SB (poster) completes, <font color="#CC3333">Hero raises to $2</font>, UTG folds, Button calls $2, SB folds.

Flop: ($6) 8[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/heart.gif[/img], T[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $4</font>, Button calls $4.

Turn: ($14) T[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $7</font>, Button calls $7.

River: ($28) Q[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $10</font>, <font color="#CC3333">Button raises to $20</font>, Hero calls $10.

Final Pot: $68

His river raise scares me, but I see no way out of it. Thoughts on other streets? Am I making any mistakes?