Probability - KK vs AA, both make full houses

I was playing on another site today at a 6 seat cash game and was dealt KK.

The flop was A99

Turn T

River K

My opponent turns over AA for AAA99 to beat my KKK99

Just a quick probability question - please can someone tell me the probability of this happening i.e me being dealt KK and another player being dealt AA and both of us hitting one of our cards for a full house?