Just shuuush.

One of the kindest things you can do for your partner is to not say "I told you so."

I've never heard anyone say "Thanks so much for pointing out that I was wrong, and that you were right - it makes me feel so much better now that ____ has happened."

They know you were right. You know you were right. They'll love you more for shutting up about it. 

This advice is also consistent with THINK (from Father Pat Connor - Author of Whom Not to Marry) - a way of assessing whether you should say something controversial to your partner.

T: Is it true?
H: Is it helpful?
I: Is it interesting?
N: Is it necessary?
K: Is it kind?

Saying "I told you so" complies with T only. So, best to be quiet.