Conditional probability question - Hold 'em

[pilamsolo]

I have a question regarding conditional probabilities for Texas Hold 'em. Take the following situation:

It is a 10-handed game before the flop and 5 handed on the flop. If I have one ace, and there is an ace on the flop, what is the probability that there is another player in the hand that also holds an ace?

I have tried to calculate using Bayes Theorem, but I'm doing something wrong, so any help is appreciated.