1/2, tough AA hand, play along with me

[iltw555]

Poker Stars, $1/$2 NL Hold'em Cash Game, 6 Players
LegoPoker Hand History Converter

CO: $219.80
BTN: $395.95
SB: $193
Hero (BB): $477.40
UTG: $99.15
MP: $212.95

Pre-Flop: A[img]/images/graemlins/diamond.gif[/img] A[img]/images/graemlins/heart.gif[/img] dealt to Hero (BB)
UTG calls $2, <font color="red">MP raises to $9</font>, CO folds, BTN calls $9, SB folds, hero ?

utg is a donk, 63/0/0.5 over 20 hands or so

mp is a regular, we have some 3 bet/4 bet history, he definitely thinks that I 3 bet light, he is very aggressive, rans at 27/25/3.7 over 200 hands

BTN is also a regular, 20/16/10 over 300 hands

I am running 22/18/3.2 on the table for over 100 hands and have an image that's probably a lot looser than this stat because I tried to isolate donk before me a lot and couldn't hit anything.
so how much to 3 bet here?