What to do with KK after large 3bet PF, and ace flops

[theForm42]

Do I need to shove this spot here on the flop? Or do I just check fold??? Hes 23/15/5 after 150 hands... no history no reads.

His range here has to be AK/QQ/AA right? I cant imagine any other hands he would call this 3 bet pf
FullTiltPoker Game #3384730962: Table Palamos (6 max) - $0.50/$1 - No Limit Hold'em - 21:54:32 ET - 2007/08/27
Seat 1: Joefosho714 ($42.55)
Seat 2: betwitnothin ($119.05)
Seat 3: pokercriss ($114)
Seat 4: A-Donk ($100)
Seat 5: MAC 904 ($19.50)
Seat 6: sgrb30 ($16.50)
sgrb30 posts the small blind of $0.50
Joefosho714 posts the big blind of $1
The button is in seat #5
*** HOLE CARDS ***
Dealt to betwitnothin [Ks Kc]
betwitnothin has 15 seconds left to act
betwitnothin raises to $3.50
pokercriss raises to $11
A-Donk folds
MAC 904 folds
sgrb30 folds
Joefosho714 calls $10
betwitnothin raises to $47
pokercriss calls $36
Joefosho714 calls $31.55, and is all in
*** FLOP *** [9s As 7d]