100 USD - Readless AKs preflop, Villain cold call - reraises

[K䲰䮥n]

Party Poker No-Limit Hold'em, $1 BB (6 handed) Hand History converter Courtesy of PokerZion.com

Button ($109.10)
SB ($123.14)
Hero ($100)
UTG ($94.10)
MP ($358.57)
CO ($167.90)

Preflop: Hero is BB with K[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/spade.gif[/img].
<font color="#CC3333">UTG raises to $4</font>, MP calls $4, <font color="#666666">3 folds</font>, <font color="#CC3333">Hero raises to $16.5</font>, UTG folds, <font color="#CC3333">MP raises to $45</font>, Hero?