KK against Ace flop

[Spy021]

Looking for some feedback on how I played this hand.

Party Poker 0.50/1 Hold'em (9 handed) converter

Preflop: Rookie is MP1 with K[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/club.gif[/img].
UTG calls, UTG+1 calls, <font color="CC3333">Rookie raises</font>, MP2 calls, MP3 calls, CO folds, Button folds, SB folds, <font color="CC3333">BB 3-bets</font>, UTG calls, UTG+1 calls, <font color="CC3333">Rookie caps</font>, MP2 calls, MP3 calls, BB calls, UTG calls, UTG+1 calls.

Flop: (24.50 SB) A[img]/images/graemlins/diamond.gif[/img], 7[img]/images/graemlins/heart.gif[/img], T[img]/images/graemlins/diamond.gif[/img] <font color="blue">(6 players)</font>
BB checks, <font color="CC3333">UTG bets</font>, UTG+1 calls, Rookie calls, MP2 calls, MP3 folds, BB calls.

With so many players staying in after capping pre-flop, I was pretty sure I was up against an ace. Especially seeing that several players seemed to play Ax most of the night. In addition, BB 3-bet me preflop, which also seemed to indicate a possible ace or pocket pair?

Turn: (14.75 BB) 3[img]/images/graemlins/club.gif[/img] <font color="blue">(5 players)</font>
BB checks, <font color="CC3333">UTG bets</font>, UTG+1 calls, Rookie calls, MP2 calls, BB folds.

River: (18.75 BB) 5[img]/images/graemlins/club.gif[/img] <font color="blue">(4 players)</font>
<font color="CC3333">UTG bets</font>, UTG+1 folds, Rookie calls, MP2 calls.

Final Pot: 21.75 BB

Results to follow...