10-20 Stars, KK on the flop, what to do?????

Hi have been using the last month to catch up on a ton of archives. This is really my second post, and i would like to think that following the advice of certain regulars such as El Diablo/KaneKungfu/Yeti/M.Flynn/Limon and everyone that i have missed (sorry) has helped my game. I have played occasionally at the 10/20 game at stars and at party. Mostly at 5/10 and 3/6. Well this hand took place two weeks ago, and it was a biggie for me, wanna know what the consensus is. Any advice, from anyone here is always well taken and thanks in advance.
First time posting a hand from memory so please bear with me.
10/20 NL Pokerstars 9 handed
Button : Me ($6500) with KK black
SB : Solid TAG ($4500)
MP : very fishy LAG ($2000 or so)
everyone else folded [pre flop].

MP raises 80 to a 100.
I pop it to 300 straight on the button.
SB smooth calls.
MP calls.

Pot 920

Flop
2 2 2

SB pushes all in for $4200

MP folds

Me ??????????