I ran this one through the Cambridge Poker Analyzer, and it gives the AA ~39.5%. This is why I don't play on PartyPoker, incidentally -- everyone is way too loose. I can see the call with QQ and maybe, just maybe, the AK (which ironically enough was ~3.1% to win here), but everyone else had to know they were beat, if they had any brains at all.

Overall probabilities, 1M hand Monte Carlo simulation:

AA 39.49%
AK 3.06%
QQ 18.37%
99 16.86%
55 15.27%
JK 6.95%